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  1. #1
    Broom Wagon Fodder reverborama's Avatar
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    SRAM Rival RD Adjustment

    I am having a heck of a time getting the RD just right on my wife's bike. The upper jockey pulley grabs at the chain making a clicking noise when in the big ring and smaller cogs (7th, 8th, 9th). If I turn in (slacken) the barrel adjuster I can make the noise go away but then I can't select the largest cog (1st) in either chainring. When I turn out the barrel adjuster to tighten the cable I so that I can select 1st, I go back to having the clicking noises in the smaller cogs. When you look closely and turn the crank slowly, you can see the chain stick to the pulley in certain positions as it threads through the derailleur.

    I examined the jockey pulley and there are no burrs or odd teeth. I would switch the upper and lower pulleys or flip them over but they makings indicating upper/lower and direction of travel.

    I have the upper and lower limit screws, I believe, adjusted correctly because by with the proper cable tension you can get to 1st without shifting into the spokes and you can select 10th without going off the bottom.

    I fooled with the the "B" screw (or whatever SRAM calls it) and that didn't change anything so I returned that to a setting that is fairly close to the biggest cog but not touching.

    I made sure the RD hanger was tight. I don't have a hanger alignment gauge but the bike has never been over or hit. If something is tweaked, I don't have the tools to measure that.

    Any suggestions?

  2. #2
    Senior Member
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    What cassette are you using? I had a similar problem with my Rival/SRAM cassette/Shimano freehub setup and found the lock ring wasn't tight enough to lock all the cogs. I actually had to overtighten the locknut by 2-3 ft-lbs. to cure it. Seems crazy that such a small thing could cause it but that fixed it.

    Also, on my son's CAAD9 with Shimano 105 he had a similar problem and the LBS found a slightly bent derailleur hanger despite the fact that the bike had never been dropped. It may be worth a trip to a shop.
    2010 Cannondale CAAD9-4, 1978 Jack Taylor "Tour of Britain" #7338, 1969 Jack Taylor Ladies "Tourist" #5935 (wife's), 2010 Specialized Dolce (wife's)

  3. #3
    Broom Wagon Fodder reverborama's Avatar
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    I'll take a look at the lock-ring. That's a good idea!

  4. #4
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    OK, if you're absolutely sure that nothing else is out of whack, adjust your cable tension like this:

    http://www.bikeforums.net/showthread...=#post12671697

    (look for post #3 in the thread, a step by step for index/cable adjustment.)

    But, you need to make sure that the lock ring is tight, the wheel is seated straight, the hanger isn't bent and the B and H and L stops are right (which it sounds like you've already done)

  5. #5
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    hanger alignment is really the first step of rear derailer adjustment. what size cassette?

  6. #6
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    What shifters are you using? Hopefully SRAM Rival, Force, or Red? Also, have you checked the chain with something like this: http://www.gastoncountycyclists.com/...n_Checker.html If the chain is worn, the bike will still seem fine in the often used gears but will skip in the least often used gears.

    I just thought of something else. I forget what the spacers and gears are like on my SRAM OG cassette. Maybe a missing or doubled up spacer? Is it a SRAM cassette? Was the cassette removed or serviced recently or ever?
    Last edited by pfweeks; 09-10-11 at 12:12 PM.

  7. #7
    Senior Member rydabent's Avatar
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    My Sram 7 RD says to adj the "B" screw for a clearance between the largest sprocket and the jockey wheel to 6mm. It shifts flawlessly and probably would be a good starting point.

  8. #8
    Broom Wagon Fodder reverborama's Avatar
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    The shifters and all components are SRAM Rival.

    I pulled the wheel off to check the lockring. It appeared to be tight. Put it all back together and it shifts like a dream. It must have been slightly misaligned. Not sure how that happens with vertical dropouts, but putting it all back together seems to have solved the problems. She did the race with no problems at all. I'll be keeping my eye on that...

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