JP2017035926A - Rear sprocket installation auxiliary tool for bicycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rear sprocket installation auxiliary tool which can be repeatedly used.SOLUTION: A rear sprocket installation auxiliary tool 10 comprises a reference installation part 12, a first installation part 14, at least one first connection part 16, and a positioning part 18. The reference installation part 12 is detachably engaged with a reference sprocket 20 which constitutes s reference of a phase. The first installation part 14 is engaged with a first sprocket 22 which is different from the reference sprocket 20. At least one first connection part 16 connects the reference installation part 12 and the first installation part 14 to each other. The positioning part 20 aligns phases of the reference sprocket 20 and the first sprocket 22 with each other.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a mounting aid, and more particularly to a bicycle rear sprocket mounting aid used when mounting a bicycle rear sprocket to a bicycle rear hub.

  In a rear sprocket assembly for shifting mounted on a rear hub of a bicycle, a plurality of rear sprockets having different numbers of teeth are arranged side by side in an axial direction parallel to the rotation center axis of the rear sprocket assembly. In the rear sprocket assembly, the phase of the sprocket teeth of each rear sprocket is different. For this reason, the rear hub has splines configured so that each rear sprocket can be mounted in a specific phase. A conventional rear sprocket assembly is known in which a plurality of rear sprockets having a large number of teeth can be integrally mounted instead of separately mounting a plurality of rear sprockets on a rear hub (see Patent Document 1). . This facilitates the mounting of the rear sprocket to the rear hub. In the rear sprocket assembly of Patent Document 1, a rear sprocket with a small number of teeth to be mounted individually is arranged with a bicycle rear sprocket mounting aid (hereinafter referred to as a rear sprocket mounting aid) in a state of being arranged in a specific phase. Fixed. The rear sprocket mounting aid is made of a synthetic resin having heat shrinkability that shrinks when heated. This facilitates the mounting of the rear sprocket having a small number of teeth to the rear hub.

German Patent Application Publication No. 10240140419

  In the conventional rear sprocket mounting aid, the rear sprocket is used by fixing the rear sprocket with few teeth with heat-shrinkable synthetic resin and breaking the conventional rear sprocket mounting aid after the rear sprocket is mounted on the rear hub. As a result, the rear sprocket mounting aid cannot be reused.

  An object of the present invention is to provide a rear sprocket mounting aid that can be used repeatedly.

  The rear sprocket mounting aid according to the present invention includes a reference mounting portion, a first mounting portion, at least one first connecting portion, and a positioning portion. The reference mounting portion is detachably engaged with a reference sprocket serving as a phase reference. The first mounting portion is detachably engaged with a first sprocket different from the reference sprocket. At least one first connecting part connects the reference mounting part and the first mounting part. The positioning unit matches the phases of the reference sprocket and the first sprocket.

  In this rear sprocket mounting aid, a plurality of sprockets including a reference sprocket are arranged with a sprocket having a small number of teeth facing upward. Then, the first sprocket is arranged on the plurality of sprockets in phase with the plurality of sprockets. When the bicycle rear sprocket mounting aid is mounted in this state, the reference mounting portion is detachably engaged with the reference sprocket, and the first mounting portion is detachably engaged with the first sprocket. In addition, the reference portion and the first sprocket are in phase with each other by the positioning portion. Here, since the reference mounting portion and the first mounting portion are detachable, the rear sprocket mounting aid can be used repeatedly.

  The rear sprocket mounting aid may further include an abutting portion that restricts the first sprocket from moving away from the reference sprocket in an axial direction parallel to the rotation center axis of the reference sprocket. According to this configuration, the first sprocket is not separated from the reference sprocket by the abutment portion, so that the mounting state of the first sprocket can be easily maintained.

  The reference mounting part may have an engaging part that elastically engages with the reference sprocket. According to this configuration, the bicycle rear sprocket auxiliary tool is held by the reference sprocket at the reference mounting portion, and the rear sprocket auxiliary tool is unlikely to be detached from the reference sprocket.

  At least one of the reference mounting portion and the first mounting portion may be annular. According to this configuration, at least one of the reference mounting portion and the first mounting portion formed in an annular shape easily matches the shape of at least one of the reference sprocket and the first sprocket, and the positioning portion can be easily configured.

  The positioning unit may include a reference positioning unit that contacts the reference sprocket and a first positioning unit that contacts the first sprocket. According to this configuration, since the reference sprocket and the first sprocket are respectively positioned, the phase of the first sprocket can be matched to the reference sprocket.

  The rear sprocket mounting aid may further include an indicator portion that indicates the mounting direction of the first sprocket relative to the reference sprocket. According to this configuration, when the bicycle rear sprocket mounting aid is mounted on the reference sprocket, the first sprocket can be accurately arranged by the indicator, and the rear sprocket mounting aid can be quickly mounted on the reference sprocket. .

  The reference mounting portion, the first mounting portion, and the first connecting portion are configured by a single member that is integrally formed. According to this configuration, since the bicycle rear sprocket mounting aid is integrally configured, the first sprocket can be positioned by mounting the reference mounting portion on the reference sprocket.

  The reference sprocket has more teeth than the first sprocket. According to this configuration, since the phase can be adjusted based on the large-diameter reference sprocket having a large number of teeth, it is easy to attach the rear sprocket mounting aid to the reference sprocket.

  The rear sprocket mounting aid may further include a second mounting portion and at least one second connecting portion. The second mounting portion may be detachably engaged with a second sprocket having more teeth than the first sprocket and fewer teeth than the reference sprocket. At least one second connecting portion may be connected to the first mounting portion and the second mounting portion. According to this configuration, the phase of the first sprocket and the second sprocket can be matched with the phase of the reference sprocket. Further, since the reference mounting portion, the first mounting portion, and the second mounting portion are detachable, the rear sprocket mounting aid can be used repeatedly.

  At least one of the reference mounting portion, the first mounting portion, and the second mounting portion may be annular. According to this configuration, at least one of the reference mounting portion, the first mounting portion, and the second mounting portion formed in an annular shape can easily fit in the shape of at least one of the reference sprocket, the first sprocket, and the second sprocket. It becomes easy to compose the part.

  The positioning unit may include a reference positioning unit that contacts the reference sprocket, a first positioning unit that contacts the first sprocket, and a second positioning unit that contacts the second sprocket. According to this configuration, since the reference sprocket, the first sprocket, and the second sprocket are respectively positioned, the phases of the first sprocket and the second sprocket can be matched with respect to the reference sprocket.

  The bicycle rear sprocket mounting aid may further include an indicator portion that indicates the mounting direction of the first sprocket and the second sprocket relative to the reference sprocket. According to this configuration, when the bicycle rear sprocket mounting aid is mounted on the reference sprocket, the first sprocket and the second sprocket can be accurately arranged by the indicator portion, and the bicycle rear sprocket mounting aid is used as a reference. Can be quickly installed on sprockets.

  The reference mounting portion, the first mounting portion, the first connecting portion, the second mounting portion, and the second connecting portion may be configured by a single member that is integrally formed. According to this configuration, since the bicycle rear sprocket mounting aid is integrally configured, the first sprocket and the second sprocket can be positioned by mounting the reference mounting portion on the reference sprocket.

  The single member may be made of an elastic material. According to this configuration, the reference mounting portion can be easily engaged with the reference sprocket using elasticity.

  The single member may be made of metal. According to this configuration, the strength of the rear sprocket mounting aid can be maintained high, and a strong elastic force can be obtained.

  The single member may be non-metallic. According to this configuration, the rear sprocket mounting aid can be reduced in weight.

  The single member may be made of synthetic resin. According to this configuration, the rear sprocket mounting aid can be efficiently manufactured by integral molding or the like.

  The reference mounting portion may be engaged with the outer peripheral portion of the reference sprocket, and the first mounting portion may be engaged with the outer peripheral portion of the first sprocket. According to this configuration, the reference mounting portion and the first mounting portion can be easily engaged with the reference sprocket and the first sprocket, respectively.

  The reference mounting portion is engaged with the outer peripheral portion of the reference sprocket, the first mounting portion is engaged with the outer peripheral portion of the first sprocket, and the second mounting portion is engaged with the outer peripheral portion of the second sprocket. Good. According to this configuration, the reference mounting portion, the first mounting portion, and the second mounting portion can be easily engaged with the reference sprocket, the first sprocket, and the second sprocket.

  ADVANTAGE OF THE INVENTION According to this invention, the bicycle rear sprocket mounting assistance tool which can be used repeatedly can be provided.

The front view which shows the state which mounted | wore the rear sprocket assembly with the rear sprocket mounting | wearing auxiliary tool by 1st Embodiment of this invention. FIG. 3 is an exploded perspective view of the rear sprocket assembly and the rear sprocket mounting aid according to the first embodiment. The front view of the rear sprocket mounting assistance tool by 1st Embodiment. The rear view of the rear sprocket mounting aid by 1st Embodiment. Sectional drawing cut | disconnected by the cutting line VV of FIG. 3 of the rear sprocket mounting assistance tool by 1st Embodiment. The disassembled perspective view of the rear sprocket assembly and the rear sprocket mounting aid according to the second embodiment. The front view of the rear sprocket mounting assistance tool by 2nd Embodiment. The rear view of the rear sprocket mounting assistance tool by 2nd Embodiment.

<First Embodiment>
1 and 2, the rear sprocket mounting aid 10 according to the first embodiment of the present invention is mounted on a rear sprocket assembly 6 having, for example, nine rear sprockets. The rear sprocket assembly 6 includes a first sprocket 22 that is a rear sprocket having the minimum number of teeth, and a reference sprocket 20 having the third smallest number of teeth. Therefore, the reference sprocket 20 has more teeth than the first sprocket 22. Except for the first sprocket 22 of the rear sprocket assembly 6, the eight sprockets including the reference sprocket 20 are fixed integrally, and only the first sprocket 22 is separable from the eight rear sprockets. The rear sprocket assembly 6 includes a fixing member 8a for fixing the rear sprocket assembly 6 to a rear hub (not shown), and a washer 8b. On the inner peripheral surface of each rear sprocket, nine splines are formed, for example, eight splines 9a and one spline 9b having different circumferential lengths, as shown in FIG. As a result, the phases of the sprockets can be matched.

<Configuration of rear sprocket mounting aid>
The rear sprocket mounting aid 10 includes a reference mounting portion 12, a first mounting portion 14, at least one first connecting portion 16, and a positioning portion 18. In the first embodiment, a plurality of first connecting portions 16 are provided. The plurality of connecting portions 16 are preferably provided in two to six. In the first embodiment, five first connecting portions 16 are provided. The rear sprocket mounting aid 10 further includes a contact portion 32 and an indicator portion 34. The rear sprocket mounting assisting tool 10 is configured by a single member in which the reference mounting portion 12, the first mounting portion 14, the first connecting portion 16, and the contact portion 32 are integrally formed. The rear sprocket mounting aid 10 is preferably an integrally formed member made of a synthetic resin having elasticity, such as a polyacetal resin or a tetrafluoroethylene resin.

  The reference mounting portion 12 is configured to be detachably engaged with a reference sprocket 20 serving as a phase reference. As shown in FIGS. 3 and 4, the reference mounting portion 12 is preferably formed in an annular shape. As shown in FIGS. 3, 4, and 5, the reference mounting portion 12 includes an engaging portion 40 that elastically engages with the reference sprocket 20. The engaging portion 40 includes a protruding portion 40a and a pair of slits 40b provided on both sides of the protruding portion 40a. The protrusion 40a is formed to project radially inward from an end portion of a reference positioning portion 18a, which will be described later, of the positioning portion 18. The pair of slits 40b are formed by cutting out on both sides in the circumferential direction of the reference positioning portion 18a. The pair of slits 40b are provided to facilitate the elastic deformation of the engaging portion 40. The engaging portion 40 is engaged between a pair of sprocket teeth of the reference sprocket 20. As a result, the rear sprocket mounting aid 10 is engaged with the reference sprocket 20 and is less likely to fall off the rear sprocket assembly 6.

  The first mounting portion 14 is configured to detachably engage with a first sprocket 22 different from the reference sprocket 20. As used herein, the term “removable” means that the rear sprocket mounting aid can be repeatedly detached from the mounting target object without being damaged. The first mounting portion 14 is preferably formed in an annular shape. The first mounting part 14 is connected to the reference mounting part 12 by at least one first connecting part 16, preferably a plurality of first connecting parts 16.

  The positioning unit 18 is configured to match the phases of the reference sprocket 20 and the first sprocket 22. The positioning unit 18 includes a plurality of reference positioning units 18 a that abut against the reference sprocket 20, and preferably a plurality of first positioning units 18 b that abut against the first sprocket 22. In the present embodiment, three reference positioning portions 18 a are provided in the reference mounting portion 12. The reference positioning portion 18a is formed on the inner side surface of the annular reference mounting portion 12 so as to protrude radially inward. In the first embodiment, the reference positioning portion 18 a preferably abuts between the sprocket teeth of the reference sprocket 20.

  In the first embodiment, two first positioning portions 18 b are provided on the first mounting portion 14. The first positioning portion 18b is formed on the inner side surface of the annular first mounting portion 14 so as to protrude radially inward. In the first embodiment, the first positioning portion 18b preferably abuts between the sprocket teeth of the first sprocket 22.

  The first connecting portion 16 is configured to connect the reference mounting portion 12 and the first mounting portion 14. The first connecting portion 16 preferably has a first portion 16a and a second portion 16b. The first portion 16 a extends in the axial direction from the inner peripheral portion of the reference mounting portion 12 toward the first mounting portion 14 in parallel with the rotation center axis X <b> 1 of the reference sprocket 20. The second portion 16 b extends radially inward from the first portion 16 a toward the first mounting portion 14.

  The contact portion 32 is configured to restrict the first sprocket 22 from separating from the reference sprocket 20 in the axial direction parallel to the rotation center axis X1 of the reference sprocket 20. The contact portion 32 is preferably connected to the first mounting portion 14. In the first embodiment, the abutting portion 32 can abut on the fixing member 8a. The contact portion 32 restricts the first sprocket 22 from separating from the reference sprocket 20 via the fixing member 8a.

  The indicator 34 is configured to suggest the mounting direction of the first sprocket 22 with respect to the reference sprocket 20. Specifically, the first sprocket 22 is placed on the remaining sprockets of the rear sprocket assembly 6 in accordance with the phase of the reference sprocket 20 by using the eight splines 9a and the splines 9b having different circumferential lengths as a guide. After that, the index part 34 of the rear sprocket mounting assisting tool 10 is aligned with the spline 9b, and the rear sprocket mounting assisting tool 10 is mounted on the reference sprocket 20.

<Mounting operation of rear sprocket mounting aid>
When the rear sprocket mounting aid 10 according to the first embodiment configured as described above is mounted on the rear sprocket assembly 6, the first sprocket 22 is placed on the remaining sprocket using the spline 9b as an index. In this state, the index portion 34 is attached to the spline 9b from the first sprocket side. As a result, the reference positioning portion 18 a is engaged with the reference sprocket 20, and the first positioning portion 18 b is engaged with the first sprocket 22. Further, the protrusion 40a of the engaging portion 40 provided on the reference mounting portion 12 is elastically engaged with the reference sprocket 20 between the sprocket teeth. As a result, the rear sprocket mounting aid 10 is less likely to be detached from the reference sprocket 20, and the state where the phase of the first sprocket 22 is in the reference sprocket 20 is maintained.

  When the rear sprocket assembly 6 is mounted on the rear hub, the rear sprocket assembly 6 is mounted on the rear hub together with the rear sprocket mounting auxiliary tool 10. At this time, since all the rear sprockets are in phase, they can be smoothly mounted on the rear hub. When the mounting is completed, the rear sprocket mounting aid 10 is removed, and the fixing member 8a is screwed into the rear hub to fix the rear sprocket assembly 6 to the rear hub. The rear sprocket mounting aid 10 removed at this time can be reused and can be used repeatedly.

Second Embodiment
In the description after the second embodiment, members having the same configurations as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and description thereof is omitted. In addition, although the configuration is different from that of the second embodiment, members corresponding to those of the first embodiment will be described with the same three-digit reference numerals having the same last two digits of the first embodiment.

  In the second embodiment, as shown in FIG. 6, the rear sprocket assembly 106 is provided so that the first sprocket 22 and the second sprocket 24 can be separated from other sprockets. Accordingly, the seven sprockets including the reference sprocket 20 excluding the first sprocket 22 and the second sprocket 24 are fixed integrally. The second sprocket 24 has more teeth than the first sprocket 22 and fewer teeth than the reference sprocket 20.

<Configuration of rear sprocket mounting aid>
As shown in FIGS. 6, 7, and 8, the rear sprocket mounting assist tool 110 according to the second embodiment has a second mounting portion 114 and at least the rear sprocket mounting assist tool 10 according to the first embodiment. One second connecting part 116 is further provided. The second mounting portion 114 is configured to detachably engage the second sprocket 24. The 2nd mounting part 114 is comprised by the 1st part 16a of the 1st connection part 16 of 1st Embodiment.

  At least one second connecting portion 116 is configured to connect the first mounting portion 14 and the second mounting portion 114. Preferably, two to six at least one second connecting part 116 is provided. In the second embodiment, five second connecting portions 116 are provided. The 2nd connection part 116 is comprised by the 2nd part 16b of the 1st connection part 16 of 1st Embodiment.

  The positioning unit 118 preferably includes three types of positioning units: a plurality of reference positioning units 18a, preferably a plurality of first positioning units 18b, and preferably a plurality of second positioning units 118c. Two second positioning portions 118c are preferably provided in the second mounting portion 114. The second positioning portion 118c has the same shape as the first positioning portion 18b, and is formed on the inner side surface of the second mounting portion 114 so as to protrude radially inward. The second positioning portion 118c preferably abuts between the sprocket teeth of the second sprocket 24.

Preferably, the rear sprocket mounting aid 110 further includes the same abutting portion 32 and an indicator portion 34 as in the first embodiment. The rear sprocket mounting aid 110 is a single unit in which the reference mounting portion 12, the first mounting portion 14, the second mounting portion 114, the first connecting portion 16, the second connecting portion 116, and the contact portion 32 are integrally formed. It is constituted by one member. The rear sprocket mounting aid 110 is preferably made of a synthetic resin having elasticity, such as a polyacetal resin or a tetrafluoroethylene resin.
The contact portion 32 is configured to restrict the first sprocket 22 and the second sprocket 24 from separating from the reference sprocket 20 in the axial direction parallel to the rotation center axis X1 of the reference sprocket 20. The contact portion 32 is preferably connected to the first mounting portion 14. In the second embodiment, the abutting portion 32 can abut on the fixing member 8a. The contact portion 32 restricts the first sprocket 22 and the second sprocket 24 from separating from the reference sprocket 20 via the fixing member 8a.

  The indicator 34 is configured to suggest the mounting direction of the first sprocket 22 and the second sprocket 24 with respect to the reference sprocket 20. Specifically, using the eight splines 9a and splines 9b having different circumferential lengths as a guide, the first sprocket 22 and the second sprocket 24 are adjusted to the phase of the reference sprocket 20 and the rest of the rear sprocket assembly 6 remains. After mounting on the sprocket, the index part 34 of the rear sprocket mounting aid 110 is aligned with the spline 9b, and the rear sprocket mounting aid 110 is mounted on the reference sprocket 20.

<Mounting operation of rear sprocket mounting aid>
When the rear sprocket mounting aid 110 according to the second embodiment configured as described above is mounted on the rear sprocket assembly 6, the first sprocket 22 and the second sprocket 24 are used as the remaining sprockets with the spline 9b as an index. Placed on. In this state, the index portion 34 is attached to the spline 9b from the first sprocket 22 side. As a result, the reference positioning portion 18 a engages with the reference sprocket 20, the first positioning portion 18 b engages with the first sprocket 22, and the second positioning portion 118 c engages with the second sprocket 24. Further, the protrusion 40a of the engaging portion 40 provided on the reference mounting portion 12 is elastically engaged with the reference sprocket 20 between the sprocket teeth. As a result, the rear sprocket mounting assisting tool 110 is not easily detached from the reference sprocket 20, and the state where the phases of the first sprocket 22 and the second sprocket 24 are in the reference sprocket 20 is maintained.

  When the rear sprocket assembly 6 is mounted on the rear hub, the rear sprocket assembly 6 is held together with the rear sprocket mounting auxiliary tool 110 and mounted on the rear hub. At this time, since all the rear sprockets are in phase, they can be smoothly mounted on the rear hub. When the mounting is completed, the rear sprocket mounting auxiliary tool 110 is removed, and the fixing member 8a is screwed into the rear hub to fix the rear sprocket assembly 6 to the rear hub. The rear sprocket mounting aid 110 removed at this time can be reused and can be used repeatedly.

<Other embodiments>
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of invention. In particular, a plurality of embodiments and modifications described in the present specification can be arbitrarily combined as necessary.

  (A) In the above embodiment, a plurality of reference positioning portions 18a, first positioning portions 18b, and second positioning portions 118c are provided, but the present invention is not limited to this. At least one reference positioning unit 18a, first positioning unit 18b, and second positioning unit 118c may be provided.

  (B) In the above embodiment, the abutting portion 32 indirectly restricts the movement of the first sprocket 22, but the present invention is not limited to this. The contact portion 32 may be in direct contact with the first sprocket 22 to restrict the movement of the first sprocket 22 or the first sprocket 22 and the second sprocket 24. In this case, the fixing member 8a and the washer 8b are not held by the rear sprocket assembly by the rear sprocket mounting aid.

  (C) In the above embodiment, one or two rear sprockets are separated. However, the present invention can be applied even when three or more rear sprockets are separated. For example, the number of mounting parts and positioning parts may be increased according to the number of rear sprockets to be separated.

(D) In the above embodiment, the rear sprocket mounting aid 10 (or 110) is made of non-metallic synthetic resin, but the non-metal is not limited to synthetic resin, and may be ceramic or wood. . Further, it may be made of a metal such as aluminum, titanium, or iron.
(E) In the second embodiment, the second mounting portion 116 is not annular, but the second mounting portion 116 may be annular.

10, 110 Rear sprocket mounting aid 12 Reference mounting portion 14 First mounting portion 114 Second mounting portion 16 First connecting portion 116 Second connecting portion 18, 118 Positioning portion 18a Reference positioning portion 18b First positioning portion 118c Second positioning Part 20 Reference sprocket 22 First sprocket 24 Second sprocket 32 Contact part 34 Index part 40 Engagement part

Claims (19)

A reference mounting portion detachably engaged with a reference sprocket serving as a phase reference;
A first mounting portion detachably engaged with a first sprocket different from the reference sprocket;
At least one first connecting part for connecting the reference mounting part and the first mounting part;
A positioning unit for aligning the phases of the reference sprocket and the first sprocket;
Bicycle rear sprocket mounting aid.   2. The bicycle rear sprocket mounting aid according to claim 1, further comprising a contact portion that restricts the first sprocket from moving away from the reference sprocket in an axial direction parallel to a rotation center axis of the reference sprocket. .   The bicycle rear sprocket mounting aid according to claim 1, wherein the reference mounting portion includes an engaging portion that elastically engages with the reference sprocket.   The bicycle rear sprocket mounting aid according to any one of claims 1 to 3, wherein at least one of the reference mounting portion and the first mounting portion is annular. The positioning part is
A reference positioning portion contacting the reference sprocket;
A first positioning portion that contacts the first sprocket;
The bicycle rear sprocket mounting aid according to any one of claims 1 to 4, further comprising:   The bicycle rear sprocket mounting aid according to any one of claims 1 to 5, further comprising an indicator portion that indicates a mounting direction of the first sprocket with respect to the reference sprocket.   The bicycle rear according to any one of claims 1 to 6, wherein the reference mounting portion, the first mounting portion, and the first connecting portion are configured by a single member that is integrally formed. Sprocket mounting aids.   The bicycle rear sprocket mounting aid according to any one of claims 1 to 7, wherein the reference sprocket has more teeth than the first sprocket. A second mounting portion detachably engaged with a second sprocket having a larger number of teeth than the first sprocket and a smaller number of teeth than the reference sprocket;
The bicycle rear sprocket mounting aid according to claim 8, further comprising at least one second connecting portion that connects the first mounting portion and the second mounting portion.   The bicycle rear sprocket mounting aid according to claim 9, wherein at least one of the reference mounting portion, the first mounting portion, and the second mounting portion is annular. The positioning part is
A reference positioning portion contacting the reference sprocket;
A first positioning portion that contacts the first sprocket;
A second positioning portion that contacts the second sprocket;
The bicycle rear sprocket mounting aid according to claim 9 or 10, further comprising:   The bicycle rear sprocket mounting aid according to any one of claims 9 to 11, further comprising an indicator portion that indicates a mounting direction of the first sprocket and the second sprocket with respect to the reference sprocket.   The reference mounting portion, the first mounting portion, the first connecting portion, the second mounting portion, and the second connecting portion are configured by a single member that is integrally formed. The bicycle rear sprocket mounting aid according to any one of 12.   The bicycle rear sprocket mounting aid according to claim 7 or 13, wherein the single member is made of an elastic material.   The bicycle rear sprocket mounting aid according to claim 14, wherein the single member is made of metal.   The bicycle rear sprocket mounting aid according to claim 14, wherein the single member is made of non-metal.   The bicycle rear sprocket mounting aid according to claim 16, wherein the single member is made of synthetic resin. The reference mounting portion engages with an outer peripheral portion of the reference sprocket,
The bicycle rear sprocket mounting aid according to claim 1, wherein the first mounting portion engages with an outer peripheral portion of the first sprocket. The reference mounting portion engages with an outer peripheral portion of the reference sprocket,
The first mounting portion engages with an outer peripheral portion of the first sprocket,
The bicycle rear sprocket mounting aid according to claim 9, wherein the second mounting portion engages with an outer peripheral portion of the second sprocket.

Images