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My bike has SRam X3 gears and a grip shifter. I'd like to change for a trigger shifter. In the bike shop where I bought it, they say that I can change for a Shimano shifter (they don't have SRam). I've read that they aren' compatible.

Is it true? How can I discover if they are compatible before changing the shifter and the grip?

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up vote 2 down vote accepted

SRAM X series and most (all?) of the road stuff has a 1:1 ratio. Shimano is (I believe) 1.5:1; you are asking for drive-train tuning hell if you mix.

Cassettes, mix all you want. Shifters and derailleurs should be matched.

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They do sell adapters which fix the pull ratio. As long as the store installs it properly with an adapter, then I could see this as a viable option. Although I'd take the bike for a test drive to ensure shifting was smooth before paying them. – Kibbee Dec 6 '12 at 17:21

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