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Max inflation?(4 posts)

Max inflation?filly
Mar 6, 2003 11:35 PM
How much above the recommended max air pressure for a tire can you go? My Cont. Ultra 2000's say 120 psi, but I put in a little over 125--no problems, no flats. I just put on some Michelin Hi-Lite Prestige tires tonight (they were on sale at Performance), and they say a max of 116. I have these inflated to 125 as well. I haven't ridden on them yet, so I can't speak for how they'll do. By the way, the first time I'll ride 'em is this Saturday, my first race. I should probably deflate a bit to the max advertised psi, because I sure don't need a flat. I will be pissed.

Does anybody else overinflate? By how much? How do you think my new tires will hold up (they're much thinner than the Conti's)?

By the way, and I know this isn't new information to anyone, but I destroyed 3 tire levers, punctured a new tube, and actually broke a sweat trying to put those bastard Michelin's on. I was freakin' livid at how difficult the job was. I'd guess it took me close to an hour to do each tire. Freakin' nuts. Speakin' of, the itch is fading.
Overinflation provides no benefit...biknben
Mar 7, 2003 5:21 AM
Overinflation is going to produce a really harsh ride and be real sketchy while cornering. There's a reason the max pressure is printed on the tire. I wouldn't recommend going over it. I can't say I've seen a tire just blow off a rim but I'm sure it's happened.

When just training, I pump my tires to just below the max. I do that to avoid pinch flats. To be honest the tires feel best the next day when a little pressure has released. For racing days, I keep them 10psi below max.

If you have trouble with pinch flats at lower pressure you could go to a wider tire which would provide more cushion.

BTW: I've never tried Michelin tires but I've ridden with those who do. I've watched them scream and curse while trying to mount a tire. I've seen them break levers on the side of the road. People swear by them but I'm not willing to give them a try. Changing a tube should not have to be that hard.
Overinflation can create a loud bang....rogue_CT1
Mar 7, 2003 10:32 AM
Happened to me a few weeks ago. I was working on my bike and wheels after my wife and son were in bed. I mounted a Vitoria tire onto my wheel and began to pump. Like a fool I never checked the recommended tire pressure. I got up to around 140 psi before the sidewall and tube blew out in a loud explosion. Did I mention it was exactly midnight? Well, needless to say, I woke up my wife and son who both thought a gun had been shot off. Pretty dumb I have to say.

Never had a problem changing Michelins.
Third-hand tire pressure safety report.Silverback
Mar 7, 2003 8:50 AM
I can't attest to this personally, but when I lived in San Jose, my neighbor's brother worked for Specialized. He said the way they set max tire pressures is by inflating a sampling of them until they blow off the rims--then the max is set for half of that average.
I agree, BTW, that there's not much benefit to overinflation for the average rider. But there's certainly going to be a safety margin built into those things if you want to give it a try.