Chain problem

[Paul Hunter]

Hi All

 

Please could somebody explain to me why my chain seems to come off the big chain ring especially over rocky sections. This has become a pain now. Do I just need to adjust my FD?

 

Thanks in advance

Paul

[fanievb]

https://community.bikehub.co.za/topic/109516-the-great-chaincassettegears-thread/

[Paul Hunter]

I forgot to mention that this happens while I'm not peddling

[Ysterperd]

Flex in your frame over rocky sections causes chain to drop to smaller chainring

[Brighter-Lights]

I've even had a quick link disconnect on a rough downhill before but that happens once in 500 000km I guess ;-)

 

It's all about front der adjustment. What's great about SRAM gripshift is that you can fine tune the front der position and what I like to do on rough downhills where I won't pedal is tune the der one click down should be nearly rubbing the chain and the chain won't rattle off of the big ring.

 

Also change to #3 or #4 at the back to further increase the chain tension...

 

Or just get a clutch rear mech.

 

Also check how big the gap is between the front der cage and big chainring... cage should be 2-3mm higher than big ring.

Edited October 1, 2013 by Brighter-Lights

[Paul Ruinaard]

Clutch derailleur. Problem solved.

[Goodbadugly]

Flex in your frame over rocky sections causes chain to drop to smaller chainring

Huh?