bike wrench

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A place to ask bicycle repair questions, and for bike shop monkeys to share advanced non commercial wrenching resources (no YouTube self promotion). This is only for repair related topics.

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Does anyone know what this hook is for on a Di2 rear derailleur? (sh.itjust.works)

submitted 1 year ago* (last edited 1 year ago) by [email protected] to c/[email protected]

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It easily rotates 90° by hand.

After rotating it:

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[–] [email protected] 3 points 1 year ago (1 children)

This is on a Shimano Ultegra di2 derailleur that doesn't say rx on it. It definitely doesn't feel like a switch since it's smooth to rotate either direction. It doesn't click into place or give any tactile feedback.

[–] [email protected] 2 points 1 year ago (1 children)

Ok, I only have experience with it on the GRX groupset, maybe someone else can chime in on the Ultegra version. Maybe another picture with a wider frame could help :)

[–] [email protected] 1 points 1 year ago

Good idea. I added a few more pictures. Thanks anyways, I didn't know what shadow plus was before.