Mechanics and Fixing Any Questions Answered

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Stoo61

When using a larger cassette than is recommended for a rear derailleur (GRX 810 ((34T "max")) with a 40T) what is the worst that can happen?

Shitey shifting or catastrophic failure?

Thinking in a long distance touring context.

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grams in reply to @Stoo61

Pretty certain that one shifts fine with 40t.

Depending on what you’re running up front it may not be able to take up all the slack in small-small gear combos, so the lower run of chain will rub the bottom of the cage/cassette when it’s all the way back. Usually harmless.

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Stoo61 in reply to @grams

Yeah it seems that it will take a 40T fairly easily, according to various sources. A few videos show it working well.

I guess there is no real reason it should explode unduly.

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