Horrific crank noise when backpedaling - Fixie

1981.

Dropped some other wheels onto my fixie (to replace the front and rear that got stolen) and everything seems to be fine. Chainline is straight, and the front ring plus rear sprocket are meshing nicely, even under load.

However - when I apply back pressure to slow the bike, there's a horrendous noise from the front ring/crank, which sounds like the ring chain isn't meshing properly.

Tried everything, from adjusting the rear wheel, to Sheldon's tip of losening off the chainring bolts, tapping, then re-tightening, but it's still there.

The chain is old, would train stretch etc mean the pitch has been worn to the old rear sprocket?

Any help would be very much appreciated.

Cheers,
1981

mf5

Check the front ring and rear cog for wear, and put some oil on the chain see how it goes. You may need to replace your chain and/or rear cog

thel33ter

I'm no expert on fixies but a new chain and rear cog will probably help, as the chain and cog should wear together for best perfromance. Have you checked if the chainring is worn? because the chain could be jumping forwards due to the pressure being put on it.

1981.

Thanks guys - sounds like the chain is shot (rear sprocket is pretty new) - although the chainring is vintage too - so may need to replace the whole shooting match.

Thanks to the people that stole my wheels, now not only do I need to invest in a new lock – I need to spend money on chain, chainring.

Arse.

mf5

I lock my wheels, frame everything if I have to leave my bike anywhere- alot to carry in way of locks but its worth it

thel33ter

It's a good excuse to get some blingy fixie bits like coloured chains and anodized chainrings so not all bad.

mf5

A coloured chain would look quite good on my fixie actually.... where can you get them from?

thel33ter

http://stores.shop.ebay.co.uk/teme-cycl ... mit=Search

These should fit unless you use an insane gear, like a 60 tooth front ring and 23 rear

1981.

mf5 wrote:

I lock my wheels, frame everything if I have to leave my bike anywhere- alot to carry in way of locks but its worth it

Yep, learnt that the hard way (I thought for some reason, they wouldn't go for wheels they'd have to undue).

Crims can use spanners - who knew!

1981.

thel33ter wrote:

It's a good excuse to get some blingy fixie bits like coloured chains and anodized chainrings so not all bad.

Ha, yes - at least I can spend some money.

Although coloured chainrings and chains don't really go with the look (first bike in my signature)