Timeline for What exactly is the "clutch" doing on a Shimano M8100 rear derailleur?
Current License: CC BY-SA 4.0
9 events
| when toggle format | what | by | license | comment | |
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| Feb 7, 2023 at 5:51 | comment | added | MaplePanda | @Sam Let us continue in the chat. | |
| Feb 6, 2023 at 22:58 | comment | added | Sam7919 | @MaplePanda Ok.. I sort of get it—I think. Here also si.shimano.com/en/dm/MARD001/… Shimano says exactly the same thing. The contact between the metal-octopus "male" part (let's call it) the rubber-octopus female part should remain ungreased. Both together are the core part of the "chain stabilizer".The outer part consists of three bands, and so there may still be some mystery mechanism inside, but that part is not (cannot?) be disassembled. | |
| Feb 6, 2023 at 22:50 | comment | added | Sam7919 | @MaplePanda I still don't get it. He says (youtu.be/8TqdoAAn-go?t=340) that we don't want any grease inside the "roller bearing clutch", and yet the surface that is supposed to be the clutch surface is precisely the one that he greases—and on both sides! He points to the octopus-like star as the do-not-grease object. Something fishy is going on in there. | |
| Feb 6, 2023 at 22:22 | comment | added | Sam7919 | @MaplePanda Here youtu.be/8TqdoAAn-go?t=1 he shows us how it sounds when it needs maintenance. On normal (I assume) Shimano and SRAM RDs with clutches, I get a different feel. On Shimano it's snug at first, then it's smooth, but resistive. On SRAM the initial snugness isn't there, but it's resistive throughout. | |
| Feb 6, 2023 at 20:13 | comment | added | MaplePanda | @Sam The easier method is to rotate the derailleur cage in the clutched direction by hand, and feel for roughness. Alternatively, you can just perform the 5 minute clean and regrade procedure every year. | |
| Feb 6, 2023 at 16:13 | comment | added | Sam7919 | This may be a critical point, because if you’re wondering whether your three-year old clutch requires service, it would make the following a reasonable test. Hoist on a stand. Shift to smallest cog. Crank the pedals as fast as you can. Stop spinning suddenly. If the chain either derails or slaps the chainstay, the clutch is due for a cleanup. For increased rigour, crank backwards as soon as you cease cranking forward. | |
| Feb 6, 2023 at 11:02 | comment | added | Useless | There were two questions: "how does it work (mechanically/technically)?" and "how does it influence gear shifting?" | |
| Feb 5, 2023 at 20:44 | comment | added | leftaroundabout | This is a good additional point, but like Weiwen Ng's post, it does not answer the question. | |
| Feb 5, 2023 at 14:31 | history | answered | Rеnаud | CC BY-SA 4.0 |