Quote:
Originally Posted by CapriRacer
Slippage?
I think there are 2 different concepts being discussed.
1) Slippage in the direction of travel. As tires are required to generate more forward force to overcome wind resistance, the tire has to slip relative to the direction of travel to generate that force. This MIGHT have implications on RR - BUT - when RR is measured in a lab, there is no wind resistance. The only thing being measured is pure RR. That's why I think the standing wave is the reason for the increased RR.
2) Lateral slippage - as in a turn. Another way to look at this is grip. And, yes, slippage due to loss of grip is going to affect the energy loss a vehicle experiences, but I don't think that is impacting what that graph is showing.
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The cause of the splippage could be different but the process is the same: you have a segments of rubber in contact patch moving in relation to road surface and causing abrasion. Standing wave, lateral turn load, ?too much?/insufficient pressure could be causing it.
If an issue with wave was an issue, than there would have been a drop/increase at resonance frequency.
Wheels are rotation at relatively slow speeds to have the wave make all the way around wheel. At 60MPH wheels rotate at 700-900RPM.