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That sounds like a tire you would put on an old bike without hook beads. If your bike is old, you should deflate a tire and feel inside the rim where the bead of the tire seats. There should be a ridge inside. If there is no ridge in there you should leave it alone at 65psi.
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Originally Posted by davidad
(Post 16917016)
Read the entire article!
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Originally Posted by 1 Miyata Biker
(Post 16917221)
Well of course, overinflation should depend on the quality of the tires/tubes. If you have good tubes ( fairly new, not overly patched ), and quality tires that are in good condition ( sidewalls not weather checked and cracking ), overinflating them from 10% to 15% should be fine. I usually run Continential tubes and tires, size 700x32c, rated at 70 PSI. I usually run the back tire at 82 to 84 PSI and the front tire at 80 PSI. I'm 5' 11" and weigh in at 200 pounds. usually the air pressure indications on the side of a bicycle tire are there to "protect" the tire manufacturer against lawsuits. High pressure tires usually tend to lose air pressure over time. The narrow road tires of 110 to 120 PSI tires will lose more air pressure more quickly than the wider sized lower pressure tires you are discussing. My tubes/tires will hold near the 80+ PSI pressure for about a week before dropping down towards the recommended maximum of 70 PSI. I'll usually air them up where I want every 10 days or so. You're certainly right about the higher pressures have less rolling resistance.
Geez, I'm a bit over 200 lbs and I race on 25s at 90 psi front and 95 psi back, lower if it's wet. And raising the pressure does not lower rolling resistance for Conti GP4Ks, although it might for 32s on really smooth surfaces. |
I have a question about the pressure ratings of these tires. I have 700x32 tires from different manufacturers on my front and rear; the front is a Continental Contact Reflex with a maximum rating of 85 psi, while the rear is a Nashbar Gridlock with a maximum rating of 95 psi. I noted some differences in the two tires - the Gridlock is a heck of a lot stiffer, and much more difficult to get off and on the wheel - but figured that a rating difference of 10 psi wasn't a big deal and could be explained by different companies. To hear that there are 700x32 tires with a maximum of 65 psi is quite a big difference, though.
I have no doubt that some of the differences in these numbers are due to manufacturer testing methods (or their legal departments), but does the maximum pressure rating mean anything regarding tire construction or other properties? I don't mean to insinuate that higher pressures are better, either; I'm just curious if one can make inferences about a tire based on its pressure ratings. |
Originally Posted by achoo
(Post 16918895)
It's not very clearly stated. There are better articles out there about higher pressure not lowering rolling resistance.
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