I had a new XT rear mech fitted today (Replacing a LX) by my local bike shop but it doesn't seem to shift correctly. When I pull the lever back the mech moves up to a bigger cog and when I push the lever away it moves to a smaller cog.
All the rear mechs I have used before work the other way (ie lever back and the chain moves to a smaller cog and lever forward the chain moves to a bigger cog).
Is this how the XT rear mechs are supposed to work?
Have the bike shop set it up incorrectly?
If so how would I go about changing it?
The reason I am asking is because, I am going away tomorrow and I won't have time to get back to my local shop.
'''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
You apparently now have what Shimano calls a "Rapid Rise" rear derailleur and it works just as you describe; the exact opposite of the standard "high normal" derailleur. There is nothing wrong with your derailleur and the shop didn't make a mistake, it's intended to work that way.
Actually, it's not a bad system and has some theoretical advantages but it is different and may take some getting used to. The only way to "fix" it is to get a different model derailleur.