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Which wheel travels furthest?
Clive George wrote:
What I still don't know is how that shape is achieved. It could be by stretching/compressing the tyre material, or it could be by wrinkling it. (he says showing lack of words!) Will it, in some measure, be the material relaxing? The tyre must be stretched to some extent by the air pressure within, so this stretching could be relaxed in the contact patch. I've no idea of the numbers involved, so don't know if that's enough to account for the deformation needed. I have a thermarest which I fold in half along its long axis before rolling up. As I roll it up, I have to gather bunches of the mattress on one side in order to keep it straight, since it doesn't stretch or compress. That's what I mean by wrinkling, though it's an extreme case. Thinking about it, it sounds unlikely that a tyre will be doing that, so stretching/compression sounds about right. As the tyre enters/leaves the contact patch, will it scrub? It will depend on the tyre pressure, won't it? At a lower pressure the tyre deforms more and there will also be less 'pre-stretching' due to the internal pressure - so more scrub? That would certainly fit with rolling resistance being higher at lower pressures. If the numbers fit (as I've said, I've no idea what they are) it would also mean there was an optimum pressure, above which there would be no further advantage gained in reducing rolling resistance. -- Andrew |
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