Why do wheels need balanced?
22 April 2010, 01:36 PM
#1
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Why do wheels need balanced?
As above as i don't understand the reason behind it although i do appreciate the difference it makes from not having last last tyres balances properly.
22 April 2010, 01:48 PM
#7
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Now this could be my young mind being well stupid and young but i thought a round symetrical wheel with tyre would automatically be balanced?
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22 April 2010, 02:13 PM
#9
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It's very difficult (read expensive) to get an aluminium alloy wheel balanced during the manufacturing process due to the tolerances involved. Forged alloy wheels generally aren't too bad, cheaper cast alloy wheels can be worse since the tolerances allowed during manufacture are looser.
It's also nigh on impossible to correctly balance a tyre during or after the manufacturing process. Although with radial-ply tyres and modern construction methods, things are far better than they used to be in the old cross-ply days.
It's also nigh on impossible to correctly balance a tyre during or after the manufacturing process. Although with radial-ply tyres and modern construction methods, things are far better than they used to be in the old cross-ply days.
22 April 2010, 02:39 PM
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why do wheels need balanced?
why is the sky blue?
why is water wet?
why do women have secrets?
If any of you can name the movie WITHOUT goggling it, i will be impressed
why is the sky blue?
why is water wet?
why do women have secrets?
If any of you can name the movie WITHOUT goggling it, i will be impressed
22 April 2010, 04:29 PM
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It's all that heavy air - it settles down to the bottom of the tyre when you park so wheel needs to be balanced to redistribute the air properly 
22 April 2010, 04:57 PM
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22 April 2010, 09:09 PM
#16
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I won't spoil it for the others, but was it a Bruce Willis movie
Didn't need to google it, but me and MrsD did watch it on Sky+ the other night
22 April 2010, 09:14 PM
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22 April 2010, 09:22 PM
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#1 wheels are not round or perfect
#2 Tyres are same - look at the yellow, blue and red markings on a new tyre which tells the fitter where the weight/balance/run-outs are.
#3 Go look up rotational weight science.
#2 Tyres are same - look at the yellow, blue and red markings on a new tyre which tells the fitter where the weight/balance/run-outs are.
#3 Go look up rotational weight science.
23 April 2010, 01:54 PM
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23 April 2010, 02:07 PM
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Not economically possible to make wheels in dynamic balance, the tyre valve if the first irritation and it is also not possible to get a tyre to be in perfect balance either. Has to be done of course with the tyre and wheel as a unit as you will doubtless know.
Les
23 April 2010, 04:10 PM
#24
Because its a fairly weighty disk that isnt of a perfectly even weight across its circumference, the faster the wheel rotates the greater the forces involved and the more any variances in weight distribution will become apparent, the balancing machine spins the wheel up to operating speed and minitors the vibration, it tells the operator where to place a weight and what size.
My dad is an engineer who works on high speed spindles and motors, they can go up to 100,000 rpm and need to be perfectly balanced which involves adding tiny weights and drilling, he says when one is out of balance and spun to full tilt it makes a right racket and is liable to launch itself out of the machine its in, he can tell by ear as it gathers rpm whether or not its ok to proceed.
I had a Golf with alloys once, could never get them in balance, turne out not to be the wheel being balanced but the fact it didnt fit onto the locating thing on the hub, so when I tightenened the nuts it clamped down off centre, only by a tiny fraction but enough to cause massive vibration.
My dad is an engineer who works on high speed spindles and motors, they can go up to 100,000 rpm and need to be perfectly balanced which involves adding tiny weights and drilling, he says when one is out of balance and spun to full tilt it makes a right racket and is liable to launch itself out of the machine its in, he can tell by ear as it gathers rpm whether or not its ok to proceed.
I had a Golf with alloys once, could never get them in balance, turne out not to be the wheel being balanced but the fact it didnt fit onto the locating thing on the hub, so when I tightenened the nuts it clamped down off centre, only by a tiny fraction but enough to cause massive vibration.
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