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145 lbs psi? seriously?

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145 lbs psi? seriously?

Old 01-20-10, 02:24 PM
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145 lbs psi? seriously?

Vittoria Rubino Road Tire
https://www.biketiresdirect.com/pvixr...ad_tire/pp.htm

the spec says MAX pressure is 145 lbs psi. is this typical of a 700 x 23c tire?

anyone with experience with this tire?
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Old 01-20-10, 02:28 PM
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Yeah. Good tire. What's your question?

You mean, should you pump it up to 145 psi? Only if you want to.
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Old 01-20-10, 02:29 PM
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You don't run it there, if that's what you are thinking. That's just the max before you risk blowing it off the rim and/or blowing out the sidewall, whichever comes first.
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Old 01-20-10, 02:30 PM
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Use a pressure chart. You will be slower and less safe at pressure that high.
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Old 01-20-10, 02:51 PM
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I just put 700x23 Vittoria Corsa EVO-CX tires on my winter wheels. The sides say 8 to 10 bars (116 to 145 psi), and since I always inflate brand new tires to max then deflate them, off I went to 145 psi. The tire came off the rim at about 135 psi, way under the 10 bars limit.

I normally run at about 120 psi, so no concern, but Vittoria seems to have more faith in their tires than is warranted.
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Old 01-20-10, 02:53 PM
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Those tires are fine at that pressure, most rims not so much.
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Old 01-20-10, 03:01 PM
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Vrednstein also goes to 145 lbs. They were one of the best tires available until they switched their manufacturing to the far east. Quality went downhill quickly.

I occassionally pumped them up to the max. They had a nice feel to them at that pressure but were rough over bumpy roads.

Use a pressure chart. You will be slower and less safe at pressure that high.
You need to look at the chart each manufacturer does. The ideal pressure also depends upon upon how they are constructed.
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Old 01-20-10, 03:11 PM
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I always just inflate to the point that I don't get any vibrations from the chipseal around here. On my Ritchey, that leaves most tires at 105 rear/95 front, and on my former Madone, that was 115 rear/105 front. That worked out for all sorts of different tires with different Max psi ratings.

If you get to the point that it feels like a rough ride for significant periods of time, you're wasting a lot of energy. Think of it as having to climb and descend a 3mm hill every 10mm. If you can let out enough pressure that the whole bike doesn't have to make the climb, then you'll save that work for forward momentum -- it more than makes up for the minimal increase in rolling resistance.
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Old 01-20-10, 03:20 PM
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Hmmm ... you saying that at MAX pressure their diameter is so great that will notice more effort in turning them and so decrease pressure to make the diameter smaller and easier to turn the the wheel? excuse my ignorance I am not familiar with the finer points of road riding on narrow tires - I curently use 700 x 28c Specialized Armadillos at 120 psi sometimes lower but I found that even at 120 they are comfortable. I've been playing with the idea of going to a harder faster thinner tire for high speed long distance joy rides on rail trails and nicely paved roads this summer
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Old 01-20-10, 03:24 PM
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I pump my tubulars up to 170 psi. This year I'll only pump them up to 150-160 however.
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Old 01-20-10, 03:28 PM
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Originally Posted by rumrunn6
Hmmm ... you saying that at MAX pressure their diameter is so great that will notice more effort in turning them and so decrease pressure to make the diameter smaller and easier to turn the the wheel? excuse my ignorance I am not familiar with the finer points of road riding on narrow tires - I curently use 700 x 28c Specialized Armadillos at 120 psi sometimes lower but I found that even at 120 they are comfortable. I've been playing with the idea of going to a harder faster thinner tire for high speed long distance joy rides on rail trails and nicely paved roads this summer
No, he's saying that if the tire is inflated so hard it doesn't yield and form over surface irregularities then your whole bike must be lifted over the irregularity. It's a small rise but it still takes some of the effort that should be driving you forward and it is constantly being repeated as you ride.
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Old 01-20-10, 03:36 PM
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oh, OK, thanks

hey, you guys think me going from 28s to 23s will provide a noticeably more lively ride during a 60 - 100 mile ride? meaning more fun and a little easier to rack up those miles at a slightly higher average speed?
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Old 01-20-10, 03:46 PM
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Originally Posted by rumrunn6
oh, OK, thanks

hey, you guys think me going from 28s to 23s will provide a noticeably more lively ride during a 60 - 100 mile ride? meaning more fun and a little easier to rack up those miles at a slightly higher average speed?
Yes more lively/responsive/fun. Probably won't make you significantly faster though.
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Old 01-20-10, 04:09 PM
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Originally Posted by patentcad
I pump my tubulars up to 170 psi. This year I'll only pump them up to 150-160 however.
Have we lost some weight, or just can't stand on the pump as hard anymore?
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Old 01-20-10, 04:38 PM
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Originally Posted by exRunner
and since I always inflate brand new tires to max then deflate them, off I went to 145 psi. The tire came off the rim at about 135 psi, way under the 10 bars limit.
:facepalm:
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Old 01-20-10, 04:45 PM
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Max tire pressure does not equal max rim pressure. Your max rim pressure may only be 120psi. Put them up to 145, you'll be blowing sidewalls
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Old 01-20-10, 04:47 PM
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ensure not only the tire can withstand the pressure, but the rim too.
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Old 01-20-10, 04:49 PM
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Originally Posted by patentcad
I pump my tubulars up to 170 psi. This year I'll only pump them up to 150-160 however.
i go similarly high with my tubulars. is this bad?
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Old 01-20-10, 04:52 PM
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I thought the max rim pressure on most rims was simply set a little lower than most tires so that they wouldn't get blamed for a rolled tire?

Anyway, 145 would be nice on a smooth velodrome.
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Old 01-20-10, 04:54 PM
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Originally Posted by StanSeven
You need to look at the chart each manufacturer does. The ideal pressure also depends upon upon how they are constructed.
Even then there guessing. I'm no light weight and run Vittoria below or close to there minimum.
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Old 01-20-10, 05:25 PM
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Damn, I was about to mention that some folks ride on tracks.
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Old 01-20-10, 05:26 PM
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Originally Posted by Toddorado
Have we lost some weight, or just can't stand on the pump as hard anymore?
Who can say?
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Old 01-20-10, 05:35 PM
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I run too much pressure.

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Old 01-20-10, 05:52 PM
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Read Sheldon Brown's article on tires; there is a section that speaks to this issue. https://www.sheldonbrown.com/tires.html

We also have a Tech Info section, where Inflation Pressure is discussed. I assume that most tire manufacturers have similar documentation on their websites. https://www.schwalbetires.com/tech_in...ation_pressure

As for 145psi, we have tires rated to that pressure and the tire will sustain that pressure without problem.

This next part ventures into my personal opinion, and not based on anything that I've read, or that I have any sort of engineering knowledge of, but if you can slide the bead of the tires onto your rim, with little or no resistance, I'd back off of the upper limits, it would seem to me to be a somewhat loose fit. If you need to use every swear word you know to get the bead of the tire over the rim, go nuts and crank it up if you so choose.

To me, road surface plays as big a role as any in determining how much air I put in my tires. As somebody already noted, if you're riding on an uber-smooth track or road surface, high pressure is your friend. If you're riding on chipseal, a highly inflated tire is going to bounce around on you and use up your energy.
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Old 01-20-10, 07:33 PM
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On 99% of all 23c tires I inflate to 100psi no matter what it states the max pressure is.
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