Old vs new tyres
Considering the same brand of tyre, the only variable being new vs old, what do you people think would offer improved FE at highway speeds?
I'm guessing it's a question of decreased tyre circumference with the old tyres (which affects gearing and hence engine rpms), with one 'positive' of old tyres being that the tread is shallower and hence possibly more aero (I know, I'm treading on shaky ground there mentioning that, with all the safety implications - note that it hasn't rained on this island for probably 6 months or so)
Of course degradation of the rubber compound would also play a part. But does this improve Crr or what?
Food for thought.
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