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Tire pressures...beaten to death probably but here goes...(3 posts)

Tire pressures...beaten to death probably but here goes...MVN
Jun 20, 2003 2:22 PM
Does running tire pressures 5-10 psi lower than rated make them last longer? Does running them as rated make them wear faster? I've heard conflicting statements about pressures. I weigh 195 and I'm running 125 (rated) on some inexpensive training tires I got for my 5200. I had been riding an aluminum frame and running Axial Carbons at 110-115 front and 115 on the rear (their rated psi's). My lbs owner says to run them as rated, but admittedly this was when I was 20 pounds heavier. So I guess I'm asking is one way better, or is it personal preference? Should I run them as rated b/c of my weight? Thanks in advance for advice, comments, opinions, or light shed on the subject.

Mark
Effect of pressure is smallKerry
Jun 21, 2003 3:56 PM
By changing pressure, you are changing the size of the contact patch. If you increase 5-10 psi (5-10%) then the forces of pedaling have to be transferred to the pavement in that slightly smaller area. Since only the rear tire wears anyway, you could conceive that the higher pressure would increase wear by that amount. However, since the patch in very oblong in shape, you are narrowing the contact patch only VERY slightly with higher pressure. Even if you increased wear by 10%, that would only mean 200-300 miles less in most tires, and that's probably the variability in a bunch of tires anyway. You're not going to see it.
re: Tire pressures...beaten to death probably but here goes...clintb
Jun 21, 2003 10:04 PM
Outside of the wear, which we probably can guess all day at, there is the comfort factor. I also weigh 195 and used to run my 23c Carbon Comp's at 125psi. I started reading the "Uncle Al's Rant" from roadbikerider.com and saw the pressure issue come up a few times. I can't begin to tell you how much more comfortable it is to ride with tires at 100psi. Needless to say, I won't be doing the high pressure thing any more. I consider it a side benefit that I'm definately getting more mileage out of the rear with lower pressure.