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Old 07-09-13, 06:23 PM
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asmac
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Lockup when shifting to highest gear

Occasionally, esp when I'm flying downhill (and spinning the pedals) and shift to my smallest cog (already in largest chainring), the whole drivetrain suddenly locks up. That is, I can no longer pedal although, by the time I slow down and take any pressure off, everything releases and is back to normal. I have not been able to see this when stopped or duplicate it on a stand.

Any ideas as to what could cause this lockup and how to fix? It's a 9 spd XT rear derailer with a 9 spd sram chain.

Last edited by asmac; 07-09-13 at 06:28 PM.
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