XT shadow rear derailleur setup

jontymo
jontymo Posts: 127
edited June 2008 in MTB workshop & tech
Just bought an ex demo Trek Fuel Ex 8 from LBS, had a couple of rides on it but have an issue with the first 2 gears, i can ride from 3rd gear to 9th no problem but when i try to get in first or second gear it keeps skipping between them, if i keep my thumb on the gear lever it will engage and stay in 1st gear but when i remove my thumb it jumps again, i then have to change to 3rd, which is a bit annoying as i'm not that fit so gets me blowing a bit on the hills!!!!

I'm not to good on bike mechanics so any advice will be gratefully received.

Cheers
jontymo

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