Aquaplaning speed

[Q45tech]

"The reason is that there is a relationship between tyre pressure and the speed at which there is the onset of aquaplaning. In the Imperial system, the equation is 9 times the square root of the tyre pressure. So, if your tyres are at 25 psi, if you drive into a puddle that is deeper than your tread depth, you will aquaplane at 45 mph (72 km/h), whereas if your tyre pressure was 36psi, you would aquaplane at 54 mph (87 km/h). The advantages are obvious."

So a 35-36 psi max tire has one significant disadvantage since it probably cools to 28-30 psi in rain vs a 44 or even a 51 psi tire....the 10 mph difference in aquaplanning if the tire pressure is optimized at 85% of the maximum inflation.

One of the reason the 36 psi AVS Intermediate has a less than stellar reputation in the rain compared to more modern 44-51 psi tires.

But I doubt that many run the 51 psi tire at [51x 85%=44 psi Cold and 46-47 HOT.

http://www.users.totalise.co.u...9.htm

PS: to be protective at 70 mph the tire PSI would need to be 61 psi obviously impossible.

Check out the Nitrogen gas pressures inside Formula 1 rain tires!