I've noticed recently that the chain appears to click and do a slight 'jump' every now and again. I reckon I've done just over 2000 miles on it from new. It could be that the chain is starting to wear out, but that said, I only started to notice the chain clicks after I fixed a rear puncture. I was wondering if when I refitted the wheel it slackened the chain. Does the rear wheel just drop into its slot when you refit? Any chain tensioning needed at that point? Maybe the chain is starting to wear out anyway and it had nothing to do with refitting the wheel. Any thoughts on either the chain or refitting? I have an '07 Spesh Sirrus. I've had it 1 year from new. Thanks.