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10-26-2016, 08:33 PM | #1 | |
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Bias Ply T & F!
True or false:
1. Bias-ply tires in general handle inferior to radials. 2. Bias-ply tires require more toe - specifically toe-in - to handle more predictably. 3. As opposed to radial tires, bias-ply tires require negative caster for straight-line stability. 4. Bias-plies give more warning that they are about to break loose in a high-G turn than do radials. |
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10-27-2016, 08:40 AM | #2 | ||||
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Re: Bias Ply T & F!
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True, but that particular property has been dialed out of modern radial tires, so it isn't as true as it once was. |
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10-28-2016, 04:58 AM | #3 | ||
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Re: Bias Ply T & F!
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Ok. #2. was based on my readings that, given the same vehicle, putting bias-ply tires on a car with alignment specs for radials resulted in a white-knuckle driving experience. The writer stated that on his car at least, radials needed very little toe in, but the bias plies needed at least 1/6" toe in to achieve the same feel. #3. Do you know which caster is which? Negative = axis leaning forward(toward front of vehicle), and Positive = axis leaning backward. For the last 40 years, at least, the vast majority of vehicles have called for POSITIVE caster(from half a degree up to seven degrees depending upon purpose of vehicle). For reasons I never quite understood, a lot of cars from 1960s and earlier speced negative 1-2 deg caster, and they were from the bias ply era. |
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10-28-2016, 08:32 AM | #4 | |||
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Re: Bias Ply T & F!
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10-28-2016, 10:09 AM | #5 | ||
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Re: Bias Ply T & F!
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On Toe-in: It's not that the radials were more sensitive to toe-in, it's that they probably tracked straighter and were just as stable with less. The amount of toe-in required for stability with bias tires would probably cause premature wear on the radials. On Caster: I suspect the way the bias-ply tires 'gave' under dynamic stresses and weight was different than how radials give, so negative caster provided directional stability to them, as opposed to simple trail caster(positive) used with radials. I don't know the specifics on that, perhaps someone with more engineering prowess could contribute. All I'm trying to suggest here is that millions of everyday people - not race car drivers - drove on bias ply tires from before one war to well after another, safely, without having to 'saw' the steering wheel back and forth - just a movie and TV trope used to indicate driving and being in motion while in the safety of a sound stage, with a giant projection of a highway behind it. And aligning properly for bias-ply tires, I.E. negative instead of positive caster, and different toe settings than we might spec today, were part of that. |
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