NormPeterson
Structural
- Sep 11, 2003
- 1,474
As I understand it, "run-flat" tires are rated for some number of miles at such-and-such a speed at zero inflation. 50 miles @ 50 mph @ 0 psi seems to be common.
What sort of distance rating might apply to run-flat tires that are occasionally used at an inflation pressure temporarily reduced by a few psi from the mfr-recommended value for activities such as driving off road or for a little more compliance to avoid shocking the tire into spinning on the pavement at drag racing? Say, down on the order of 20 - 25 psi.
Would there be a huge reduction in rated speed from such a tire's rating at a more "proper" inflation pressure?
I'm guessing that this is a fatigue matter, and that it might even have application under "normal driving" circumstances should a RF tire be allowed to lose a little pressure but not enough to trip the TPMS lamp (thereby goading the driver into doing something about it).
Norm
What sort of distance rating might apply to run-flat tires that are occasionally used at an inflation pressure temporarily reduced by a few psi from the mfr-recommended value for activities such as driving off road or for a little more compliance to avoid shocking the tire into spinning on the pavement at drag racing? Say, down on the order of 20 - 25 psi.
Would there be a huge reduction in rated speed from such a tire's rating at a more "proper" inflation pressure?
I'm guessing that this is a fatigue matter, and that it might even have application under "normal driving" circumstances should a RF tire be allowed to lose a little pressure but not enough to trip the TPMS lamp (thereby goading the driver into doing something about it).
Norm