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RD Guide Pulley Adjustment?

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RD Guide Pulley Adjustment?

Old 04-29-12, 09:19 AM
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TWong1200
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RD Guide Pulley Adjustment?

RD Guide Pulley Adjustment?

So I'm having a weird issue with my RD. It shifts just fine but while I pedal, there's an annoying clicking sound as the chain rotates. It's a SRAM Apex RD and to give a little background, this all happened after this chain of events.

1. Ran over a screw at 35mph while going downhill. The screw punctured my rear tire and went completely through it and through the wheel itself!
2. Walked into LBS to buy a new tube and tire
3. Scored incredible deal on a set of EA90 SLXs
4. Went home, swapped my cassette to the SLXs
5. Installed new wheels and tires
6. RD was noisy so I assumed it was out of adjustment so I tinkered with it to no luck; still noisy
7. Took the bike to the LBS where I bought the wheels and they adjusted it for me
8. Thought it was good but during my first ride out, I noticed a slight amount of noise. Didn't think anything of it.

Upon inspection, I can see that although my RD is adjusted correctly and shifts fine, the guide pulleys are crooked. They are cock-eyed when looking at them in relation to the cassette. I rode 55 miles yesterday on them and they did great so the performance is fine. Just this dreaded clicking noise is driving me nuts!

My question: Is there a way to adjust the pulleys?

Note: The bike has never been dropped so nothing should be bent!

The arrows in this photo show that the back part of the pulleys are pointed left.

Any help offered is appreciated! Thanks.

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Old 04-29-12, 09:25 AM
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mechBgon
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1. you didn't mention what type of cassette, but if it happened to be a Shimano, make sure you have your 1mm spacer on the freehub body first, unless it's the deep-spline type of freehub body. This doesn't pertain directly to your RD issue, but a loose cassette will be noisy in its own right, so I thought I'd mention it. If your cassette is SRAM then no spacer is required.

2. if possible, I'd check the frame's RD hanger alignment first, using a RD hanger alignment tool. Some RD hangers are very stout, some are quite soft... it's not out of the question that a really soft one could get tweaked accidentally without crashing/dropping the bike.

3. if that all checks out, and the tweak is in the RD itself, then you need a new RD. There's no adjustability for that issue.
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Old 04-29-12, 09:31 AM
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Thanks for the help.

1. It's a SRAM cassette. It's definitely not loose. LBS has checked that as well, just in case.

2. Hmm...would this also occur on a carbon bike? I don't have an alignment tool so would probably take it back to the LBS for that

3. I was afraid you'd say that. I think before I go that route, I think I'll try to bend it by hand to see if that helps. Nothing to lose at that point.

Thanks again
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Old 04-29-12, 09:37 AM
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Hmm...would this also occur on a carbon bike?
Yeah, it could. The most flimsy RD hanger I've seen so far is on the current Cervelo S5. It bends very, very easily. Just a rough wheel removal could jeapordize the alignment on that one. Doing a precise assessment of the alignment will call for the alignment tool, so yeah, have the LBS check it out.
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Old 04-29-12, 09:39 AM
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Gotcha, thanks
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