Whats Wrong?

After repairing yet another puncture on my rear wheel i replaced the wheel and took it for a spin. I noticed that as i pedaled i was feeling a sort of clicking through the pedals in the same place on every revolution 2 or 3 clicks to be precise . Taking a closer look i turned the bike upside down and slowly turned the wheel. It turns out that in certain pints of the revolution the chain becomes extreemly tight and at other points its quite slack couple of mm both up and down. The only thing i can think of is that the chain ring is slightly bent out of shape and that the clicking noise is the chain not going onto the teeth of the chainring teeth very accurately. Does this sound about right or could it be something else?

Any advice much appreciated.

Cheers.

chain too tight. no chaining is completely round, so if its binding at all, slacken it off a bit.

Could be you haven't got the chainring seated properly, same thing happened to me once... Had to loosen off the ring then tap it 'til centred...

Your chain is almost certainly too tight, seeing as this first happened after replacing the wheel.

A couple of mm movement is not slack by any means - you're supposed to have about 2.5cm of movement either way. And as bombadil said - you'll always get tight spots, just make sure they don't bind.

Cheers guys will will have a lookey at lunch time.

O

2.5cm each way!? thats alot.

What about rotating the chainring one or two holes on the crank? Worth a try, only take a minute. There was a similar thread about this recently...

aidan 2.5cm each way!? thats alot.

ah, actually that's my poor conversion of inches to cm. It should be about half an inch each way, which is actually 1.25cm...doh!

i was going to say (well i did)...it might be wrong but i like mine tight ;)

I always find the tight spot on my chainline and tighten the wheel from there, but it could be a number of things :( time for a new chain if its stretched out and not sitting on the teeth properly, worn chainring/rear cog and the teeth start to look like waves from where its worn and hook the chain as it goes round making a clicking sound.