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Old 04-17-12, 04:20 PM   #1
GB243
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700 x 32c tire question

I just put some 32c tires on my bike which is used for road and a little trail riding. The side wall says the psi is 85 max but when I ride the tire drops enough to make me worried.

Question is this; I weigh about 220lbs, should I put the 85 psi the sidewall says or should/could I go up a bit?
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Old 04-17-12, 04:25 PM   #2
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85 psi should be the max. I wouldn't put it any higher than that. What brand and tires?
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Old 04-17-12, 04:26 PM   #3
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They are Continental Contact 700s.

http://www.rei.com/product/731367/co...ntact-700-tire
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Old 04-17-12, 04:37 PM   #4
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Yes 85 psi is the max and 70 should be around the minimum. Maybe recheck the pressure or with a different tire pressure checker. Just to make sure.

Find the specs here. Click on the Specs tab.

http://www.biketiresdirect.com/produ...l-contact-tire

Last edited by ChowChow; 04-17-12 at 04:40 PM.
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Old 04-17-12, 04:39 PM   #5
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Is there a press gauge for bike tires or will my hand pump gauge work?
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Old 04-17-12, 04:44 PM   #6
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Is there a press gauge for bike tires or will my hand pump gauge work?
REI sells single pressure gauges. The one on your pump should work, but just to make sure that it is working properly. Check it on another pressure gauge checker.
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Old 04-17-12, 04:59 PM   #7
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Sweet. Thanks for the help.
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Old 04-17-12, 05:45 PM   #8
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If all you have is a hand pump. I recommend for you to get a floor pump. A hand pump is usually just for temporary use and is not made to pump up tires to very high pressure.
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Old 04-17-12, 05:47 PM   #9
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I have a set of Conti Contact tires on one of my bikes. While they do look they have a large amount of tire drop, but they have low enough rolling resistance that they still roll well at 85 psi. Conti Contacts give a pretty good balance between performance and ride comfort.
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Old 04-17-12, 08:49 PM   #10
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I have a set of Conti Contact tires on one of my bikes. While they do look they have a large amount of tire drop, but they have low enough rolling resistance that they still roll well at 85 psi. Conti Contacts give a pretty good balance between performance and ride comfort.

Sweet. I took them for a short test ride earlier and they were pretty nice. Slimmer than my previous tires but great. I'm still learning a lot.
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Old 04-17-12, 08:57 PM   #11
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5-10 more psi isn't going to cause tire failure. Continentals do tend to run narrow but still 85psi should be plenty of pressure for a 32c tire with your weight. You're aiming for 15% deflection not a rock hard tire.
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Old 04-17-12, 10:59 PM   #12
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5-10 more psi isn't going to cause tire failure. Continentals do tend to run narrow but still 85psi should be plenty of pressure for a 32c tire with your weight. You're aiming for 15% deflection not a rock hard tire.

How do yu figure out the deflection percentage? I've seen it before but it's been a bit. I guess that should be something I need to know for future uses.
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