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Old 09-24-11, 07:00 AM   #1
billyymc
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Drivetrain grinding when wet

Have noticed in the past couple of weeks, that whenever my bike (2007 Tricross Comp) gets wet that I get some kind of funky noise and almost a grinding feeling in the drivetrain. I'm 99% sure it's not the crank -- cause if I hop off the bike and spin the crank backward - no noise.

After riding home last night in the rain, it seems like it's coming from the cassette area. Going to throw it on the stand and look for anything unusual later today. But any ideas would be appreciated.

Would a worn chain act like that for any reason? I've got almost 6k miles on this chain, so time to replace it anyway I guess.
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Old 09-24-11, 08:21 AM   #2
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Riding through puddles splashes grit into your chain from the front wheel.

Get a clip-on chain cleaner. They work pretty good. Don't use a hose to rinse because they can force water past the seals into the hubs.

Measure the chain for wear. 25 pins should measure 12" and if it's much over 12-1/16" or 12-1/8" you have worn out your chain. Grit is very abrasive so it's a distinct possibility. Riding around with a worn chain is harder on the cassette and chainrings even if it doesn't skip much.
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Old 09-24-11, 05:21 PM   #3
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I was getting drive train noises last week. I rode through some puddles in the weekend and thought maybe I had some bad seals in the BB, or a slipping crank, or some other issue with the new chain. Turned out to be my track pedals. The cages were loose. put some loctite on the bolt threads and re-tightened them. I tested a different pair for torque and realized that those pedals has the cages on so tight, I nearly bent and broke my 3mm premium allen wrench loosening one of the cage bolts. So they are on very tight.
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Old 09-24-11, 05:27 PM   #4
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Noise when coasting is the cassette. Noise when pedaling is the chain. Noise all the time is the hub. (not always, but this is the place to start). Odds are that the rain is flushing out your chain lube, and flushing in road grit. The best defense is prevention through good chain lube selection. A good wet lube (see my signature - yes, I'm biased) will keep the rain out of your chain and let you ride in wet conditions without worry.
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Old 09-24-11, 06:16 PM   #5
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Drivetrain grinding when wet <-- ride the bike in good wheater and avoid water and rainy days!
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Old 09-24-11, 06:33 PM   #6
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Water is actually not a bad lubricant. The problem is that it dries...

+1 that you should definitely measure your chain for wear.

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Noise when coasting is the freewheeling mechanism...
This is what you meant, right? I don't think I've ever heard a cassette make noise
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Old 09-24-11, 06:38 PM   #7
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Water is actually not a bad lubricant. The problem is that it dries...
It also carries grit with it into the chain.
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Old 09-24-11, 06:46 PM   #8
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Quote:
Originally Posted by FastJake View Post
Water is actually not a bad lubricant. The problem is that it dries...

+1 that you should definitely measure your chain for wear.



This is what you meant, right? I don't think I've ever heard a cassette make noise
Yes, life was easy when it was just freewheels. These days you have to say "freewheel or freehub" or as you corrected "freewheel mechanism" or something similar. I assume in this context that readers would read cassette to imply the ratchet mechanism which is in fact part of the hub.

I once made the mistake of calling it the overrunning clutch (which is probably most correct) but nobody knew what that was.
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