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Unwanted downshifts over bumps

 
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Old 02-05.-2008, 10:23 PM   #1
Duncan Smith
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Default Unwanted downshifts over bumps

Gears on the MTB (Shimano XT) are all set up nice, instant changes, no
noise - perfect on the road. But when pedalling over bumps (pot
holes, off road etc) the chain-ring deraillieur has a tendancy to down-
shift by one towards the inner-most sprocket.

This is confimed in the trigger pod window as it will either have
moved from 3 to 2, or from 2 to 1. To make sure I wasn't knocking the
trigger I fisted the left handlebar grip - still does it.

Any thoughts on where I should be looking to solve the problem - in
the pod or at the mech??

Many thanks,

Duncan
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