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Old 06-03-2008, 01:42 AM   #66 (permalink)
Duffman
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Quote:
Originally Posted by mattW View Post
This thread is proving very inconclusive, we haven't seen why:
  • Higher pressure means it is more likely to have tyre failure? we've yet to see that higher pressure increases tyre stress (since it means less deformation), obviously extremely high pressures beyond sidewall. Though we have seen that the stems may be a problem.
  • Higher pressure reduces traction? since friction is proportional to the force and the coefficient of friction, not area. I have yet to see why contact patch makes a difference.
  • Higher pressures i.e. 10% over sidewall are dangerous? in light of the above two points.
Short ugly answer is they do
A) Ever seen a balloon that was overfilled until it burst? Why did it fail?
B) Dont believe this one, do dragsters, F1 or Nascar run wide or narrow tires? I have seen a load, slip angle and traction plot for a racing tire and thier is a point where a tire is overloaded wrt the traction it can produce. Also tire traction is very temperature dependent and it may be hard to believe but a tire can exceed a Cf of 1.0. The basic 100 level physics you took university do not hold well for tires.
C) See A) & B)
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