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Quote from: Surferdude on May 25, 2013, 09:40:00Quote from: The Slim One on May 25, 2013, 00:19:52Last time i had tyres balance the machine told the operative where to place the weights.They (the balance machines) have been doing that for 40 years.But the operator still has to apply them accurately. And if the machine (most work in 5 gram increments) says 45 grams, it may be 42/3 or 47/8 which is needed. So putting on a 45 gram weight may give you a slight reading of 5 or 10 grams, some degrees off to one side. The good operator knows to try a few options. Like try a 35 gram weight in the same spot. Or move the existing weight marginally (maybe as little as a centimeter) to the side. In addition, depending on knowledge and experience with the particular car model, wheel and or tyre combination and condition of the car's suspension and rims, the operator may know whether or not a difference of a few grams will cause a problem.I saw a demonstration many years ago by a German specialist who balanced up a wheel and tyre assembly, zeroing it out with the fine tune option. He then deflated the tyre and wedged a normal sized business card between the bead of the tyre and the rim. The assembly then needed 10 grams weight on both the inside and outside rims (not in line with one another) to offset it.. This was not just because of the weight of the card but the slight difference in the "seating" of the bead against the rim.I use the white background (curve) on which yellow font is unreadable................................ Until the quote button is used when it shows as black in the reply box....but I don't always want to reply... It is difficult to comprehend how a 0.35mm displacement of a very short section of bead would affect wheel balance to the extent given.But what was the point of the card trick as the tyre needed deflating, the bead needed breaking again to remove the card and tyre re-inflating so it was back to the original position as far as balance went.
Quote from: The Slim One on May 25, 2013, 00:19:52Last time i had tyres balance the machine told the operative where to place the weights.They (the balance machines) have been doing that for 40 years.But the operator still has to apply them accurately. And if the machine (most work in 5 gram increments) says 45 grams, it may be 42/3 or 47/8 which is needed. So putting on a 45 gram weight may give you a slight reading of 5 or 10 grams, some degrees off to one side. The good operator knows to try a few options. Like try a 35 gram weight in the same spot. Or move the existing weight marginally (maybe as little as a centimeter) to the side. In addition, depending on knowledge and experience with the particular car model, wheel and or tyre combination and condition of the car's suspension and rims, the operator may know whether or not a difference of a few grams will cause a problem.I saw a demonstration many years ago by a German specialist who balanced up a wheel and tyre assembly, zeroing it out with the fine tune option. He then deflated the tyre and wedged a normal sized business card between the bead of the tyre and the rim. The assembly then needed 10 grams weight on both the inside and outside rims (not in line with one another) to offset it.. This was not just because of the weight of the card but the slight difference in the "seating" of the bead against the rim.
Last time i had tyres balance the machine told the operative where to place the weights.
Had 2 tyres fitted to the front of daughter's car. Yellow dot over the valve. FWIW
Yellow dot over the valve. FWIW
Quote from: Phil. on May 27, 2013, 11:02:28Had 2 tyres fitted to the front of daughter's car. Yellow dot over the valve. FWIWDid the fitter put them on or on from the factory?
As my last sentence said, it demonstrated how much effect on tyre balance is caused by the tyre's beads not seating correctly
Mine just fell off after a few months...
Quote from: eye30Mine just fell off after a few months...* Shambles reads back through the thread to get some context...