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Tire pressure question(17 posts)

Tire pressure questionthe bull
Apr 20, 2003 5:09 AM
I have been pumping my tires to 120psi.
Does anyone use more like 130psi?
Just wondering.The michelin sidewall says 116psi.
A rim strip says 130! I think thats if you had a rated tire of 130 the rimstrip would hold thatas well.
re: Tire pressure questionmackgoo
Apr 20, 2003 5:42 AM
I always keep my tires pumped to the max. I've always felt it reduce's punctures to run like this.
The more I learn, the more conservative I become.Spoke Wrench
Apr 20, 2003 7:21 AM
I never go over 120psi, even on my tandem.

I used to be pretty cavalair about tire pressure. Since then, I've seen friends blow a tire off of the rim and I've heard about lots of other tire blow offs.

Everybody looks at the label on the tire and assumes that it includes a generous safety factor. Hardly anybody has the slightest idea what pressure their rims are rated for. Also, an older rim that has had some brake surface wear won't manage the same amount of air pressure as a new one.
plus, lower pressure is more comfortableweiwentg
Apr 20, 2003 8:43 AM
Michelins at 100psi ROCK. I know the Axial Pros and Carbons were designed for a max of 110. you can easily inflate beyond that - I used to inflate to 120 - but I think 100-110 is much better. rolling resistance is still low.
plus, lower pressure is more comfortableRLinNH
Apr 20, 2003 9:57 AM
I go for 100 to 110.
Ditto.KG 361
Apr 20, 2003 3:32 PM
I used to pump my tri-comps up to max pressure, around 150 psi. After reading more, and after blowing a tire off a rim (fortunately this happened in my garage) on an older bike, I've gone with less pressure. 100 psi on my fixies (all older rims) and my beater/trainer bike and 120 psi on my KG 361 with Ksyriums.
how do you measure pressure?dtufts
Apr 20, 2003 1:03 PM
Just curious. I've been using cartriges and going by "feel".
Pressure guage?KG 361
Apr 20, 2003 1:18 PM
If you go by "feel", you may pop a tire off the rim, especially w/cartriges. I'd get a floor pump if I were you. Most have guages on them.
Really!the bull
Apr 20, 2003 3:35 PM
So before every ride you top off tires with cartrides?
Sounds expensive!
re: Tire pressure questionLeroy
Apr 20, 2003 2:47 PM
I just got a new set of Vittoria Open Corsa evo that I ran at 110 rear and about 100 or a little less in front and they were pretty comfortable. Great tires, incidentally. I have some axial pros that are 700x25's that I run at 100 rear and 95 front.
I never go over 110.
Over Inflation May Cause other problemsmerckxman
Apr 20, 2003 3:51 PM
I remember reading comments from Michelin saying that if you over inflated their tire (don't remember which one) the handling capabilities in the wet were significantly reduced.
a quality pump is good long-term investmentBenR
Apr 20, 2003 8:53 PM
Get a pump with an easy to read gauge and looks well made. Plastic barrels are bad. Don't skimp, but you don't need to go super expensive either.

I can't think of many names/models off the top of my head, but I have a $50 blackburn TP4 trakPump Pro that is rock solid and the rubber seal still hasn't worn out after 4 years of continuous and often abusive use (like yanking the clamp off the valve stem rather than opening and pulling at same time). It is not the absolute fastest nor highest pressure (who needs 220 psi anyway?) pump, but it is one of the best and doesn't leak. There are plenty of good pumps for $40-60.

I'm 170 lbs. and run Michelins at 100-110. I think Continentals handle and ride better(yes, that seems counter-intuitive) when they are inflated closer to their max 120 psi, so I typically go 120 rear, 110 front. Inflating tires above their max doesn't really make you go faster and makes the ride much harsher, in addition to reducing traction and casing and tread life. I might pump tubulars up to 130-150 psi in a time trial, but it's more to make me feel better than anything.
My advicemickey-mac
Apr 20, 2003 9:40 PM
unless your tires are rated under 115 psi, pump your front and rear up to 115 and have fun.
If the tire says 116 psig:Alexx
Apr 21, 2003 4:12 AM
Then, that is the highest pressure that the tire is rated for. Put 130 psig in it, and have fun when the bead blows off the rim!!
Always follow manufacturer recomendationsjohnrg
Apr 21, 2003 7:13 AM
Never exceed max pressure on the sidewall. Remember it does say maximum. Michelin tires require less pressure ie..25's up to 100 and 23's to 110. I ride the 23 pro races at 100 and 105 f/r. The 25's at 90/95. For me compliance plays a part over road imperfections and the higher the pressure the more jarring the ride. The issue is not will the rim strip hold the pressure it's what did the manufacturer design the tire to do and at what optimum pressure. Don't make blanket decisions about tires same as you would not put same pressures in a range of car and truck tires or different load capacities and sizes.
It depends on a few factorsjw25
Apr 21, 2003 8:24 AM
Namely - what do you weigh, what size are the tires, and what do you ride over?
The more you weigh, the higher you want your tires, up to a point. The max inflation is on the tire for a reason - and it's not to say "always ride me at this number, no matter what". Riding and racing mt. bikes has taught me a little bit about tire pressure, since we run 30-50 psi there, and changing a tire's pressure by 2-3 psi makes a noticeable difference.
So, if you're a lightweight, don't go so high. For 23mm Michelin's, I use 90-100 pounds, and I run 150 dressed to ride. I also use the Axial Pro 25's in winter, and those are perfect for me at 80 front, 85 rear. Big, comfy, and no slower than the 23's.
If you ride a lot of cobbles or gravel, then maybe add 5 psi front and rear. I regularly hit a graveled road for half a mile, and haven't had any pinchflats at the pressures above. Of course, you need to avoid the big stones, but the occasional one seems to just bounce off.
And, while everyone seems to think that more pressure = less rolling resistance, it stops at a certain point, above which all you do is lose cornering traction. Besides, the gains are tiny compared to wind resistance. The only time I pump tires towards their max is for TT's, and they're mainly straight-line, and I use 20mm tires that need all the pinch-protection they can get.
This is what I was looking for thanks!nmthe bull
Apr 21, 2003 8:47 AM