On (13 Sep 98) Bob Lawrence wrote to Roy Mcneill...

 RM> One of the selling points of a steel radial, though, is the
 RM> idea that the extra rigidity of the tread reduces wear.

 BL>  Advertising aside... a steel radial can have softer sidewalls for
 BL> the same distortion, which allows the tread to remain in contract with
 BL> the road rather than roll over, the way fabric tyres with stiffer
 BL> sidewalls do. The steel radial actually distorts more... in the
 BL> sidewall, to keep the tread on the road and therefore wear less.

This is the exact argument I'm using to say that tyre pressure
doesn't affect speedo readings. If one revolution of the
circumference on the road covers the same linear distance,
regardless of the shape of the tyre, how can pressure affect the
speedo?

Cheers


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