Tire Pressure which one...

Red__Zed · 04-11-2011, 04:48 PM

Quote:

Originally Posted by ChrisSlicks

This is also useful for explaining how pressure requirements and load ratings change with vehicle speed as well.

Tire Tech Information - Air Pressure/Load Adjustment for High Speed Driving

good info.

Quote:

Originally Posted by ChrisSlicks

The number on the door jam is what you want to go with as the cold pressure (that is 35 psi as already mentioned).

From experimentation at auto-x I've found the ideal hot pressure is around 38 psi front, 35 rear. The rears don't heat up as much as the fronts do, even when you try.

We have our crappy weight distribution to thank for that.

Nismoracer · 04-11-2011, 05:50 PM

Read it, and it says you need more psi the faster you go. So using the max psi# on the side of the tire is ok. I wondered why the recomendations on cars is always lower than max psi on the sidewall. On bikes they tell you to inflate to max psi on the sidewall.

ChrisSlicks · 04-12-2011, 07:04 AM

Quote:

Originally Posted by Nismoracer

Read it, and it says you need more psi the faster you go. So using the max psi# on the side of the tire is ok. I wondered why the recomendations on cars is always lower than max psi on the sidewall. On bikes they tell you to inflate to max psi on the sidewall.

You need more pressure at very high speed because as you go faster there is more heat generated in the sidewall, you need the extra pressure to reduce the heat generation from sidewall flex. In doing so you are also reducing the load capacity of the tire (after a certain point) and reducing the amount of grip available from the tire. The numbers I quoted give you maximum grip.

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04-11-2011, 05:50 PM	#2 (permalink)
Nismoracer Enthusiast Member Join Date: Nov 2010 Location: Earth Posts: 420 Drives: 10 Nismo Rep Power: 15	Read it, and it says you need more psi the faster you go. So using the max psi# on the side of the tire is ok. I wondered why the recomendations on cars is always lower than max psi on the sidewall. On bikes they tell you to inflate to max psi on the sidewall.