Backpedal chain moves down cassette

bigmul

Hi All,

When I stop at lights and backpedal in big chainring and big sprocket the chain will jump down chai rings, yet when cycling forwards it's fine. Any idea why this is?

Thanks

dgunthor

it's an extreme gear to use big/big as the chain is at a great angle, hence it's keen to change gear - maybe your chain is worn?
could also try adjusting front deraileur

FieldMusic

Its generally bad practice to do too much in big/big or small/small, the angle of the chain will lead to increased chain wear, big/big is particularly bad as it also stretches the chain. Really you should change down on the front.

But whatever, the chain still shouldn't pop off, try loosening the 'L' limit screw on the rear mech more details.. http://www.parktool.com/blog/repair-help/rear-derailler-adjustments-derailleur

drlodge

The chain will come off due to the sharp angle its at when on big-big. Tweaking limit screws or L screws won't change a thing.

napoleond

Sounds like you need a new bike.

lostboysaint

NapoleonD wrote:

Sounds like you need a new bike.

Or just ask yourself why on earth you're back-pedalling?

rafletcher

lostboysaint wrote:

NapoleonD wrote:

Sounds like you need a new bike.

Or just ask yourself why on earth you're back-pedalling?

That's easy - get the pedal in the right place to start off.