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  1. #1
    Junior Member GB243's Avatar
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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?

  2. #2
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    85 psi should be the max. I wouldn't put it any higher than that. What brand and tires?

  3. #3
    Junior Member GB243's Avatar
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    They are Continental Contact 700s.

    http://www.rei.com/product/731367/co...ntact-700-tire

  4. #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 05:40 PM.

  5. #5
    Junior Member GB243's Avatar
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    Is there a press gauge for bike tires or will my hand pump gauge work?

  6. #6
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    Quote Originally Posted by GB243 View Post
    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.

  7. #7
    Junior Member GB243's Avatar
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    Sweet. Thanks for the help.

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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.

  9. #9
    Saving gas on my commute Scooby214's Avatar
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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.

  10. #10
    Junior Member GB243's Avatar
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    Quote Originally Posted by Scooby214 View Post
    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.

  11. #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.

  12. #12
    Junior Member GB243's Avatar
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    Quote Originally Posted by Dunbar View Post
    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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