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Saturday gravel loop, 64 km is today at 08:30, Meet at the station clock. 64.2 km with 610 m of climbing, about 70% gravel, and a café stop at Hill Farm at the halfway mark.

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Rear derailleur skips under load after a new chain. Worn cassette?

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Repairs

I fitted a new chain last weekend and now the rear skips whenever I push hard on the climbs, mostly in the three smallest sprockets. The old chain measured 0.75 on the checker, so I left it too long. Is the cassette worn out, or is there something I can try first? It is an 11 speed cassette with about 6,000 km on it.

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U

Mine was the jockey wheels, oddly enough. Worn teeth on them made it skip in the same cogs.

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U

Good thread. I have just ordered a chain checker off the back of it.

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U

New cassette fitted this evening and it is silent under load. Thank you all, marking Jonas's answer as the solution.

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Topic Author

A

Asha Rao

@asha_rao

Topic Stats

Created Thursday, 08 October 2026 01:26
Last Updated Thursday, 08 October 2026 01:26
Replies 0
Views 722
Likes 3

Category

Repairs

Diagnoses, fixes and the tools that make them.

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