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Old 07-26-07, 08:51 PM   #1
mlvosa
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Fix that grinding noise?

We purchased a Cannondale MT3000 last year and have enjoyed the world of tandem riding. Early this season we developed grinding noise that would only start after 10 - 15 miles. To make a long story short, after a couple of months of replacing bottom brackets, chain rings, and chains, only to have the noise get worst. I'm hoping I've got the problem nailed. I was able to pin point the noise coming from the hub. I took the bike to yet another bike mechanic that thought I was crazy because the hub did not have any classic signs of going bad, but he agreed to rebuild it. He had to contact the manufacture (DT Swiss?) of the Coda hub because he did not know how to tear down the hub assembly. They told him that the freewheel assembly, if not maintained properly, was know to present a grinding noise.

I don't have the bike back from the shop yet, but I'm very hopeful. I thought I'd post my find because after searching many threads for an answer, I never saw this explanation.

Wish me luck!
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Old 07-26-07, 11:59 PM   #2
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Did the noise stop while coasting?
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Old 07-27-07, 04:10 PM   #3
mlvosa
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Yes, we only got the noise while peddling. The clicking sound while costing is much louder than any other bike Iíve been around.
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Old 07-28-07, 07:15 AM   #4
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Originally Posted by mlvosa View Post
I thought I'd post my find because after searching many threads for an answer, I never saw this explanation.
There are a couple mentions of the Hugi & Coda hub problems dotted in the Tandem forums, but this one probably is the one with the most detail: Hugi compact rear hub failure. Help?

Bottom Line: If you have a Cannondale with a Coda hub be very attentive to periodic maintenance on the rear hub, i.e., cleaning and relubrication of the star ratchet mechanism. PM seems to be the key to their longevity.
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Old 07-30-07, 10:15 AM   #5
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Hi
We had a similar sound that started after we'd done about 2000 miles on our Trek T2000. Thereafter it started after about the same as yours, 10 miles but has gradually got worse. We also did the changing BBs, chains and everything else over a about a 2 month period but couldn't work out what was causing it. It was definitely linked to our peddling though. We finally narrowed it down to the rear wheel (Bontrager Race lite) but thought it was the spokes rubbing together at the cross points but this turned out to be wrong.

We finally decided by process of elimination that it must be the spokes sawing away on the outward facing flange of the hub (which I think but am not sure is a DT Swiss) as the wheel 'flexed' under load. We couldn't think of any way to deal with it though. We tried lubing which helped for a short time but then the noise came back.

18 months later after another 5000 disconcerting miles a spoke finally went and sure enough, the hub flange had been warn where the spoke had been rubbing on it.

To date, I've been so impressed with the Bontrager Race Lite. The roads where we live are not good and have gone over some horrible pot holes at high speed. And we're a 170 kg pairing. But the wheels have stayed solid and true. Even when the spoke went we were able to ride the 5 remaining miles home. But we have no solution for this problem yet. Indeed, we ended up using the noise to improve our peddaling action because it only happened (initially) when we stamped and we could make it go away by peddling more smoothly. But it's so annoying. It just resonates through the whole frame!

Be interested to know whether it was your hub and whether you've got rid of the noise yourself.

And I'd be very grateful for any suggestions on how to deal with our problem.

Cheers
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Old 07-31-07, 08:22 PM   #6
mlvosa
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The bike shop could not get the hub apart because he did not want to break it. I went after it with a break it or replace it attitude and got it apart. The free-wheel mechanism was full of rust. I cleaned it with WD-40, wire brush, toothbrush and a rust remover. After reassembling with a little white grease we went for a 52 mile noise free ride. We can't believe how quiet the bike is now, it sounds like a "normal" bike. We now know that this needs to be maintained annually.
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Old 07-31-07, 08:33 PM   #7
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Originally Posted by mlvosa View Post
The bike shop could not get the hub apart because he did not want to break it. I went after it with a break it or replace it attitude and got it apart. The free-wheel mechanism was full of rust. I cleaned it with WD-40, wire brush, toothbrush and a rust remover. After reassembling with a little white grease we went for a 52 mile noise free ride. We can't believe how quiet the bike is now, it sounds like a "normal" bike. We now know that this needs to be maintained annually.
Congratulations on your repair. You stuck with it and solved it, that's great. It seems I once read that Hugi suggests (demands?) that you use a special lubricant that they sell. I also seem to remember that this is fairly critical, but it's been a couple years since I remember reading this, so I can't say for sure. Again, congratulations!
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Old 08-01-07, 02:19 AM   #8
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Thanks for the update. Glad you sorted out the problem. Sounds as though it is different from my problem. Think I'll create a new thread to see if anyone else has any thoughts on mine.
Cheers
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