Murray wrote:I had the chain and rear cluster replaced (along with new wheels) just before ATB last year. After the first couple of rides the chain slipped frighteningly when I hit a hill or pushed off hard from the lights. I tweaked the cable adjusters and it got better but quickly deteriorated. Back to the shop. Adjusted and much better but not perfect still. Once the bike's rolling there's no problem but if I jump out of the saddle to try to push it hard up a short hill (I still can't push hard up long ones!) or just to start quickly in traffic, there's often a slip giving me a very noisy freewheel rotation until the pedal's at the bottom of the stroke. I don't get the typical cable out of adjustment clickety click.
Has the whiff of a slack chain
Does it happen in all cogs or just the smaller ones? If the former is the chain length correct? If the latter is the rear der sufficiently taking up the chain slack?
Pop it up on a stand and check chain tension up and down the cluster.