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Discussion Starter #1
I was in a race on sunday and my rear shifting went a little crazy on me. Usually when I shift to an easier gear in the rear it works just fine. But on Sunday maybe because I wasn't easing up on my pedaling, when I would try to shift to an easier gear, at first it would go and then the chain would jump to a smaller cog. This mainly happened if I tried shifting down more than one gear.

Is there a quick fix for this, ie. turning the barrel adjuster or something?

Thanks.
 

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'brifter' is f'ing stupid
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no, there is not an easy fix for this, at least via the internet. not sure how you think someone on a forum will be able to tell you what to do to fix this. there are a number of things you should check, though...
1) take a look at your derailleur hanger alignment from directly behind the bike...the derailleur cage (where the pulleys are, the chain runs through it) should be straight up and down, not bent towards the wheel or twisted in any way. if the bike has fallen over on the drive side or been bumped into somehow, or crashed, you need to check the hanger before doing anything.
2) check the limit screws. usually these won't just mysteriously go out of adjustment, but it is always good to be sure. shift to the easiest gear and push (gently) on the derailleur body trying to make the derailleur over-shift into the spokes. adjust as necessary...then shift down to the smallest cog and pull on the derailleur, again...adjust as necessary.
3) check the cable tension...easiest way to do this is to put the bike in a work stand or have someone hold the rear wheel off the ground while you pedal the bike. shift into the smallest cog, and if your bike doesn't have internal cables, check the tension of the cable. it should be just slightly snug in that position. now, w/ the wheel off the ground, pedal the bike. shift one gear...if the chain doesn't quite go up to the next gear, turn the barrel adjuster counterclockwise, try a half turn. if the chain goes past the second cog and rubs agains the third cog, back the barrel adjuster off a half turn.
try these things and see what happens...
 

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Discussion Starter #3
Thanks for your input. From you experience, should all gears be accessible without FD chain rub when in the small chain ring? I seem to be getting it when in my 39 x 12-11. Granted I usually don't like to cross chain but I thought SRAM feathering is only in the big chainring. I'm using 2010 Force by the way.

thanks.
 

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danielc said:
Thanks for your input. From you experience, should all gears be accessible without FD chain rub when in the small chain ring? I seem to be getting it when in my 39 x 12-11. Granted I usually don't like to cross chain but I thought SRAM feathering is only in the big chainring. I'm using 2010 Force by the way.

thanks.
Well, there's your problem...

No, you shouldn't be cross chaining like that. Right in Sram Force installation instructions it says don't use that combo of gears. You are almost certain to get chain rub on the FD cage and will be wearing the chain, cassette and all the drivetrain parts a lot faster due to the heavy strain. Same you shouldn't be using the largest chainring with the largest cassette cog. This isn't just with Sram stuff, it's true with most multi-chainring systems.
 
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