Quote:
Originally Posted by litesong
If you pump up tires over the recommended pressures, you must monitor those pressures carefully. A 51 PSI cold tire pressure at sub-50 degree temperatures on a western Washington morning in the shade, can be sky high on a 111 degree eastern Washington afternoon in the sun driving 75 MPH with a heavy load.
Without carefully advising people such, your instructions are dangerous & people must ignore your post.
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Everyone should check their pressure once per week, either way; but the excess pressure from ambient temperature isn't much, and the increase in cold pressure means that the tire won't heat up anywhere near as much from the high speed/heavy load. In fact, if you're going to run high speeds and heavy loads, you're
supposed to increase your tire pressure, sometimes beyond the tire manufacturer's maximum cold pressure rating. See
http://www.tirerack.com/tires/tirete....jsp?techid=72 (titled "Air Pressure/Load Adjustment for High Speed Driving") for example; in a part about driving on the Autobahn, it says:
Quote:
In order to accommodate higher speeds, the tire size and inflation pressure recommendations are tuned beyond what is branded on the tire's sidewalls.
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That means that tires are safe when overinflated even beyond their stamped maximum, though I still don't support exceeding that number in the US for insurance/liability reasons. Just the same, there's
no need for fear when increasing inflation.
Like I said, I don't recommend exceeding the maximum pressure rating; but I know it is safe to do, probably up to 200% or more of the rating (that's an educated guess). You will feel the uncomfortable ride and bouncy handling LONG before you risk tire failure, which would most likely happen in the form of the tire bead coming unseated from the rim.
thisisntjared's suggestion of "try 44-51psi. 37 really isnt much at all..." cannot possibly be dangerous on any common modern US-market automobile.
For more links and information on common tire pressure concerns, see the tire pressure link in my sig.