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

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

 Take a look at the "IF" in your statement.

Regards,
Bob

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