Wobbling/unbalanced Rear End.
#1
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Wobbling/unbalanced Rear End.
With my new Jamis Aurora touring bike I suspect the rear wheel requires balancing of some sort. When on the bike stand I spin the rear tire at a fast rate and it seems to bounce up and down. At first I suspected the rim might be distorted but it seems fine, perhaps it's not perfect and required wheel truing? Or could it be the crappy stock tires they put on? Upon close examintation the tire does seem a little malformed.
It's a very noticeable vibration, if I hold the bike up from the seat post and spin the tire it's very noticeable...almost too much.
Any ideas what may be causing the problem and how I can remedy it?
Thanks
It's a very noticeable vibration, if I hold the bike up from the seat post and spin the tire it's very noticeable...almost too much.
Any ideas what may be causing the problem and how I can remedy it?
Thanks
Last edited by Turd Ferguson; 10-30-07 at 07:34 PM.
#2
Destroyer of Wheels
Does the tire jump up and down or does the rim jump?
If it's the tire it's probably not seated right, you may have to deflate it and make sure the bead around the entire tire is on the rim.
If it's the rim you may either have a flat spot from hitting something or the wheel isn't trued.
The lbs you bought it from should be able to fix either problem under warranty if it is new.
If it's the tire it's probably not seated right, you may have to deflate it and make sure the bead around the entire tire is on the rim.
If it's the rim you may either have a flat spot from hitting something or the wheel isn't trued.
The lbs you bought it from should be able to fix either problem under warranty if it is new.
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Turn the wheel slowly next to a fixed object with and without the tire to see which is out-of-round.
If the tire is seated properly and the rim is round but the tire is still out-of-round then you may have a defective tire, it's happened to me.
Al
If the tire is seated properly and the rim is round but the tire is still out-of-round then you may have a defective tire, it's happened to me.
Al
#7
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If you spin the rear wheel fast of ANY bike in a bike stand, the whole thing will vibrate like crazy. Perfectly normal.
Now, if it vibrates like that on the road, then definitely do the above posted checks.
Now, if it vibrates like that on the road, then definitely do the above posted checks.
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BTW, your weight on the bike eliminates this when you are riding.
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Last edited by rmfnla; 10-31-07 at 02:53 PM.
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On cheap bikes it'll do this yes. Espeically ones with fat tires that don't seat correctly. There's also an important distinction between normal bounce in the stand and bounce because of an improperly seated tire.
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(See? I'm anal, too!)
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#12
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You guys ADD weight? Why would you do that? Why?
#14
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I was going to say, that balacing bicycle wheels is probably overkill from a functional perspective. Even on very fast descents, 50 mph+, I have never had a wheel feel unbalanced. With the low mass of wheels, I think you would have to really get them spinning before you felt any vibration.
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1980 3Rensho-- 1975 Raleigh Sprite 3spd
1990s Raleigh M20 MTB--2007 Windsor Hour (track)
1988 Ducati 750 F1
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I was going to say, that balacing bicycle wheels is probably overkill from a functional perspective. Even on very fast descents, 50 mph+, I have never had a wheel feel unbalanced. With the low mass of wheels, I think you would have to really get them spinning before you felt any vibration.
My comment about the split shot was kinda in jest although I have seen people do it. I love fast mountain descents (like that last section in the Rosarita-Encinata ride!) and have never noticed a wheel being out of balance.
I don't think there's enough weight variation and/or speed involved for it to matter.
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