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Tire goes around.....and up and down

Old 01-16-05, 11:02 PM
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motion5447
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Tire goes around.....and up and down

I really cant figure this out.

I have a mid range set of 700c wheels. They were recently tuned. When i lift up the rear by the back of the seat and give the crank a hard spin, i can feel the seat going up and down from the gyro effect of the wheels. If i look down the tire it seems straight in all directions.

Could the presta valve be doing this? is my tube not seated right?
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Old 01-18-05, 02:52 AM
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Steven Golding
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You may only be "Half-True" and likely need to check your spokes all around... you also could have a spoke length problem... one I caught my LBS after a stock rim came in and they did me a "favor" and built the wheel ( I have since taken that task on myself

Hope this helps... happy spinning!
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Old 01-18-05, 07:03 AM
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are you suggesting your wheel is unbalanced? I think I've seen counter-weights on some new wheels.

If your wheel is true, it could be your tyres are out of shape. I use 20mm Gran Prix tyres, pumped up to about 150psi, and they seem to go slightly out of round after about 2000 kms.

Last edited by 531Aussie; 01-18-05 at 08:25 PM.
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Old 01-18-05, 03:06 PM
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A true wheel is true for both round and left to right wobble. Sounds like your wheel isn't round. Also check to see that it is dished correctly (the rim lines up with the denter of the hub.

If it was way off before you had it trued, then they probably tightened the spokes only on one site to take out the wobble and then didn't check the round.
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Old 01-18-05, 08:25 PM
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In a magazine picture I'm looking at, it looks like there's a counter-weight on some Ksyriums
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Old 01-19-05, 12:30 AM
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Originally Posted by 531Aussie
In a magazine picture I'm looking at, it looks like there's a counter-weight on some Ksyriums
Is it the computer magnet?
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Old 01-19-05, 07:50 AM
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Originally Posted by SanDiegoSteve
Is it the computer magnet?
Nah, they're on both wheels. It could just be an elaborate join.

Check out the little lumps at the top of the Ksyriums

https://www.litespeed.com/bikes/2005/ultimate.aspx#
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Old 01-21-05, 07:39 PM
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yeah, i really didnt think it was untrue. But i found the problem, im ridding a brooks champion flyer. Its sprung so i guess that the wheel caused a little pulse it the saddle, didnt think to grab the frame.

dum dum dumb
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Old 01-22-05, 10:53 PM
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I had a set of Rolf elans that required counter-weights (provide by rolf, if you ask) under the rim tape opposite the valve stem as well as mounting the magnet opposite the stem too, plus you could, per rolfs owners manual, only use short stems, which required the use of an adapter when inflating with my floor pump. What a pain in the a$$ ! Needless to say I don't have them any longer, sold them after snapping a rear non-drive side spoke while pulling away from a stoplight, with only 600 miles on the wheels.
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