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The wheels on the bike go thump, thump, thump(6 posts)

The wheels on the bike go thump, thump, thumpt0adman
Aug 19, 2003 3:51 PM
I noticed it about 2 weeks ago. It's a very subtle *thump, thump, thump* from the front wheel that increases with speed. I've checked the wheel and tire and don't notice any irregularities. It doesn't affect performance but it's mildly annoying. Any suggestions?

Sorry about the earworm topic title. ;)
If the rim is true, it's the tire/tubeKerry Irons
Aug 19, 2003 4:24 PM
Sometimes hard to spot, but this sort of thing is typically tire or tube, most typically tire. If you are sure it wasn't there when you installed, then the likely cause is hitting a rock or sharp edge which has dinged the casing somewhere. A tube patch (LARGE tube patch) could cause this too, though less likely. IME, it comes with the tire and you just now noticed it, though it has been there all along.
re: The wheels on the bike go thump, thump, thumpMikeBiker
Aug 19, 2003 5:06 PM
It could be part of the tube caught in the tire bead and making it slightly out of round. I would deflate the tube and check that tire bead is clear of the tube and reinflate. If the noise continues then I would replace the tire and see if that solves the problem.

Mike
Loose spoke??shakyfish
Aug 19, 2003 6:16 PM
I had some wheel noise come on slowly. I thought it was a bearing possibly but found a loose spoke. I was actually pretty shocked at the noise it was making. This will be magnified the lower your spoke count. I have Bon-Race-Lites which is a low count rim.

Good Luck.
Flat spot on circumference of rimpitt83
Aug 20, 2003 4:18 AM
If you've hit something square on, you can flatten the circumference of the rim. I ran over a stick about 1" in diameter and trashed a CXP-21 front wheel this way. Hit a curb, pothole, etc. recently? Check it in the truing stand and watch for the outer edge to dip. Look from the side and not the rear to notice. Could be rebuild time as these really can't be pulled into round in the radial dimension.
Check for bananasboyd2
Aug 20, 2003 6:02 AM
Many years ago when I used to take alot of MTB camping trips with my friends there was a trick played that went like this. A guy won't get up for the morning ride. Deflate a tire on his bike. Insert a bannana between the tire and tube. Install the tire and re-inflate the tube. It does not take long to figure out, but boy is it messy!

But seriously just last week I had a similar problem and I thought I had knocked a wheel out of true. It took me a few minutes of examination to see the tire had come out of round. A cut in the sidewall had allowed the casing to shift to one side. It kind of looked like a lock-washer.