Sram Red 22 FD keeps tossing the chain
Moderator: robbosmans
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Hello all, I hope you can help me diagnose my problem or decide which solution is best.
On my wife's bike, the Red 22 Yaw FD consistently throws the chain off the big ring almost every time she shifts up. If I trim back the limit screw even the slightest, the chain rubs the FD cage. Basically, I'm dealing with either a rubbing chain or tossing the chainring. It really is one of the other.
I had set up the 10-speed Yaw derailleur on my bike with no issues, and I followed all the guidelines issued by Sram when I set up the FD on her bike when the way I did it ran into problems. I even brought her bike to the LBS to have them fix it, but it's the same problem.
She is running a Specialized crank with Specialized chainrings, and at this point, I am starting to wonder whether it is a faulty FD or if the Yaw FD doesn't work well with her Specialized chainrings. Do you have any suggestions to fix the problem, or should I start shopping for a new FD or chainrings?
Thanks
On my wife's bike, the Red 22 Yaw FD consistently throws the chain off the big ring almost every time she shifts up. If I trim back the limit screw even the slightest, the chain rubs the FD cage. Basically, I'm dealing with either a rubbing chain or tossing the chainring. It really is one of the other.
I had set up the 10-speed Yaw derailleur on my bike with no issues, and I followed all the guidelines issued by Sram when I set up the FD on her bike when the way I did it ran into problems. I even brought her bike to the LBS to have them fix it, but it's the same problem.
She is running a Specialized crank with Specialized chainrings, and at this point, I am starting to wonder whether it is a faulty FD or if the Yaw FD doesn't work well with her Specialized chainrings. Do you have any suggestions to fix the problem, or should I start shopping for a new FD or chainrings?
Thanks
Assuming the FD is healthy this issue is most likely related to chain-chainring compatibility. On rare occasions I have thrown the chain over the top on my Red 22 and Red 10 speed set ups, and usually a quarter turn of the limit screw solves the problem with no rubbing.
Double check the height of the FD, that can also be a factor.
Double check the height of the FD, that can also be a factor.
wheelsONfire wrote: When we ride disc brakes the whole deal of braking is just like a leaving a fart. It happens and then it's over. Nothing planned and nothing to get nervous for.
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When adjusting the outer limit screw, you simultaneously need to pull the lever completely. I had the same problem because I overlooked that part of the manual...
If you already did this correctly, I'm not much of a help here... .
If you already did this correctly, I'm not much of a help here... .
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A little more information please. Which way does the chain fall off the big ring? The obvious, to the outside? On which ring does the chain rub the FD cage when you "trim back the limit screw"? What does that mean? Which way are you allowing the cage to move, to the outside or to the inside by this trimming? Which plate is the chain rubbing, the inside plate or the outside one? And on what rear cogs are you set when the chain rubs the FD cage. All, just the smallest cog, the smallest two cogs, etc.
Robert
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I fixed my chain rub while on the big gear and big chain ring by placing the fd in a toe in position. Now I have nothing but flawless shifting. I hope that makes sense.
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To answer all the questions, the height is proper, and it is lined up properly according to the lines on the derailleur and the big ring.
The chain goes off the big ring toward the pedals - regardless of rear cog. When setting the bike up, I set the trim positions with the chain in the big ring and 11 cog. If I pull the trim in even the slightest bit, to keep the chain from coming off, the chain starts rubbing the outer FD cage.
The chain goes off the big ring toward the pedals - regardless of rear cog. When setting the bike up, I set the trim positions with the chain in the big ring and 11 cog. If I pull the trim in even the slightest bit, to keep the chain from coming off, the chain starts rubbing the outer FD cage.
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if you say you have other SRAM FD's why not try swapping in one of those to see if there is any improvement. Could it possibly be the FD hanger?
Detailed pictures would be a big help.
Detailed pictures would be a big help.
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topflightpro wrote:To answer all the questions, the height is proper, and it is lined up properly according to the lines on the derailleur and the big ring.
The chain goes off the big ring toward the pedals - regardless of rear cog. When setting the bike up, I set the trim positions with the chain in the big ring and 11 cog. If I pull the trim in even the slightest bit, to keep the chain from coming off, the chain starts rubbing the outer FD cage.
I haven't set up Yaw so I'm not qualified to comment about that. On a regular FD I would wonder whether you have the FD toed in at the rear. That would cause such a problem. One has to wonder also about your chain line. Do you have shims/spacers in your bottom bracket that may have the crank offset to the left? Or a mismatch between you BB shell and bottom bracket and crank thst could be causing the problem?
Robert
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Another thing, do you have spacers on your rear hub that may be pushing the cassette too far to the right? Maybe an 11-speed cassette on a 10 speed hub with or without spacers.
Robert
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