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New rear mech, very stiff in use

step83step83 Posts: 4,170
edited January 2014 in MTB workshop & tech
Not sure if ive fluffed up the setup here but my new rear mech is very stiff. Is it the case you have to bed them in?

Mech is a M662 Shimano SLX shifters are XT M770s which are perfect with my old mech whiz up and down smoothly. Anything obvious i should be checking?

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