What makes a wheel out of true?
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What makes a wheel out of true?
What makes a wheel out of true? Does it depend on riding styles, aggresiveness, equipment, type of impact etc etc?
does keeping your tire inflated to the recommended PSI value help keep the wheel true for a longer period of time?
does keeping your tire inflated to the recommended PSI value help keep the wheel true for a longer period of time?
Last edited by stillcovalent; 06-02-11 at 08:08 PM. Reason: added details
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Any time you hit a pothole, curb, or obstacle, it causes the wheel to flex, the spokes stretch and compress. When the spoke stretches beyond its elasticity limit, or the spoke nipple comes a few turns loose (or is yanked a few threads) or a spoke breaks, these will cause the wheel to be out of true.
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Or if a wheel is improperly built: either wasn't stressed properly (to let the spokes and nipples "set") or simply the spoke tension is uneven. Such a wheel will go slowly (or quickly) out of true even under normal use.
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as far as I know... Hitting the spoke with the mallet while playing bike polo and bunny hoppin lol
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Riding over a land mine has also been known to cause a wheel to go out of true, among other things.
Besides that, there's the more mundane bumps and such.
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Besides that, there's the more mundane bumps and such.
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Since the tension on each spoke is very, very high and the tension is balanced between all the spokes of the wheel, even a small movement of one spoke nipple can case the rim to move. The direction depends on the spoke and it's relationship to the other spokes around it.
Another part of the relationship is due to the nature of the fastener. Since the spoke is a very thin diameter bolt that is very long, it can flex and bend with use. When new, the spokes are bending to conform to all of the stresses that the wheel has to take during normal use. The spoke bends to conform around the hub and to settle into equilibrium with the other spokes of the wheel. These can cause a change in tension on the spoke nipple. If the changes are uneven...and they almost always are uneven..., the spokes with end up with uneven tension and the wheel won't be true anymore.
Another mechanisms is spoke twist. If the spokes had a little twist to them when they were tensioned during the build, riding...with it's constant loading and unloading of the spoke...will relieve the twist. Some spokes might end up tighter and others looser and the wheel will be untrue.
Tire pressure probably has the least effect on whether or not a wheel remains true. Riding style and impacts have more effect but probably not as much as you think. The build and attention to early maintenance of the wheel has the most effect on whether or not a wheel stays true long term.
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Stuart Black
Plan Epsilon Around Lake Michigan in the era of Covid
Old School…When It Wasn’t Ancient bikepacking
Gold Fever Three days of dirt in Colorado
Pokin' around the Poconos A cold ride around Lake Erie
Dinosaurs in Colorado A mountain bike guide to the Purgatory Canyon dinosaur trackway
Solo Without Pie. The search for pie in the Midwest.
Picking the Scablands. Washington and Oregon, 2005. Pie and spiders on the Columbia River!
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