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Hi All,
I'm after some help / input to resolve a very irritating problem on my 2011 Stumpjumper FSR where the chain is coming off at higher speeds on rough descents. Its drops from both granny and big ring (obviously in granny ring it drops into the bike and in big ring it drops over the crank arm)
The bike has the stock SRAM 1250 triple crankset, an SLX rear mech(I had the same problem with the stock X9 rear mech), an SLX 36 to 11T cassette and a new chain that I'm sure is the right length as there is just enough chain to go big to big (same problem experience with the stock chain)
The LBS tried to adjusting the hi / lo on the front mech but it made no difference. The gears shift perfectly and the chain only comes off on fast rough descents.
I'm left wondering if it is a quirk of the crankset (unlikely) or a feature of the SJ FSR frame... if so it may force me down the route of swapping my triple for a double with a chain device.
Thoughts / suggestions or any one else experiencing this problem also?
Don't back pedal.
Check height of front mech.
Ah ha... it could be the back pedalling... on the descent where it usually happens I back pedal half a turn a few times to keep my outer foot down as the trail twists.
Its a direct mount mech so assumed there was no height adjust.
Correct on the 2nd point.
The first is something I found to make a difference.
If it's bad then maybe you need to go for a chain device or a clutch mech.
Can't say I've noticed it on my SJ. Any particular reason why it's on the big or small ring? For me the big ring is roads and the granny for steep ups. General riding and going down it almost always on the middle.
I thought the 2011 FSR came with double & bash on the front as standard, not triple? Or was that only higher end models?
I've got a 2010 FSR & never had any issues with the chain coming off even on fast, bumpy descents.
Its a Comp so came with a triple - the higher end models have the double and bash.
It comes off in middle too (tried it in granny as an experiment to see if it fell off all of the rings). It's probably habit as I've always descented in big ring, the logic being (probably flawed)if I have an unplanned dismount the teeth won't slice a hole in my leg as the chain is covering them - although clearly this is unlikely to be the case at the moment.
Have the same problem. My bike shop ordered a 2012 FSR Comp "Dangler Chain Management System" to install on my bike (no guarantees, just wanted to try it out). And, we are looking into the new "SRAM Type 2 X9 rear derailleur" that is currently being tested to reduce chain slap and drop-offs (It won't be available until Aug. 2012. Looks promising though... $116 for the part. Good review @ "bikemag.com". Click on "Gear", "Drive Train", "sram-trail-house-2012-part-i".