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  1. #26
    Senior Member GP's Avatar
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    Quote Originally Posted by vol View Post
    Isn't the inner tube prone to tear/damage/leak near the valve area if it's manipulated too frequently when putting on and removing the pump nozzle?
    I'd estimate that I've pumped some tubes up over 100 times with no issues. That's just a guess though; I've never actually counted.

    I fill my 700x25 tires before every ride. They usually drop from 95 to 85 psi.

    My commuter's 700x35 tires get filled on Sunday and Wednesday evenings for my Monday, Tuesday and Thursday commutes. They lose ABOUT 5 psi from 90 to 85.

    Beach cruiser tires are filled to 40psi whenver they get noticeably low, around 20 psi.

  2. #27
    vol
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    Quote Originally Posted by GP View Post
    I'd estimate that I've pumped some tubes up over 100 times with no issues. That's just a guess though; I've never actually counted.

    I fill my 700x25 tires before every ride. They usually drop from 95 to 85 psi.

    My commuter's 700x35 tires get filled on Sunday and Wednesday evenings for my Monday, Tuesday and Thursday commutes. They lose ABOUT 5 psi from 90 to 85.
    No issue? Maybe that is the issue: if it drops from 95 to 85 each ride, may it's due to a tiny leak around the valve stem already? And the reason I don't need to pump often may be because my tubes are perfectly sealed owing to infrequent manipulation.

  3. #28
    Senior Member GP's Avatar
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    Quote Originally Posted by vol View Post
    No issue? Maybe that is the issue: if it drops from 95 to 85 each ride, may it's due to a tiny leak around the valve stem already? And the reason I don't need to pump often may be because my tubes are perfectly sealed owing to infrequent manipulation.
    Ha! I never thought of that. Maybe you're on to something.

  4. #29
    PatronSaintOfDiscBrakes dynaryder's Avatar
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    Quote Originally Posted by vol View Post
    No issue? Maybe that is the issue: if it drops from 95 to 85 each ride, may it's due to a tiny leak around the valve stem already?
    Doubtful. Skinny,high-pressure tires lose air much quicker than wide,low pressure tires;that drop doesn't sound unusual. I used to pump the 32's on my cross commuter every Mon/Wed/Fri. I pump the 2" Big Apples on my cargo bike every two weeks or so. Also note,taking the pump off the valve is good for loosing a couple psi.

    GP:are the air levels the same in both tires or only one? If one is bleeding down more than the other,you may have an issue. If they're both the same or close,it's just nature of the beast.

    C'dale BBU('05 and '09)/Super Six/Hooligan8and 3,Kona Dew Deluxe,Novara Buzz/Safari,Surly Big Dummy,Marin Pt Reyes/Novato,Giant Defy 1,Schwinn DBX SuperSport/Qualifier,Brompton S6L,Dahon Speed Pro TT

  5. #30
    Senior Member Jim Kukula's Avatar
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    Quote Originally Posted by dynaryder View Post
    Skinny,high-pressure tires lose air much quicker than wide,low pressure tires.
    I've also noticed that the thickness of the tube makes a considerable difference. Of course, folks will generally use lightweight tubes with skinny high pressure tires and probably thicker tubes with 2 inch tires.

  6. #31
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    If its my grocery getter with me and 40kg of stuff then the highest possible pressure. I got a pinch flat with a tire inflated to 90%. If its just me, then down to 80% is fine BUT you start to feel it so I like to keep them at spec.

  7. #32
    Senior Member rydabent's Avatar
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    Do consider this when it comes to tire pressure. If you start early in the morning for a long ride and pump your say 100# tire up to its full 100#s, think what happens later. Early in the morning with your bike in the garage when you pump the tires to 100#s and then later in the day on an asphalt street that can get up to 150 degrees or more, what will your tire pressure be? I personally run my tires about 10#s less than the maximum especially on a hot summer day.

  8. #33
    Senior Member TromboneAl's Avatar
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    Quote Originally Posted by Jim Kukula View Post
    Gotta say, the squeeze test is really rotten.
    I've calibrated my squeeze. I pumped a tire to 85 psi, squeezed it and noted "That's the point at which I need to add more air." I pumped it to 100 (my preferred pressure) and noted how it felt. I give myself a refresher course now and then. There's a small, but discernible difference.

    Thus, before each ride, I can do two quick squeezes and decide whether I need to pump or not.
    My Book: Drive, Ride, Repeat: The Mostly-True Account of a Cross-Country Car and Bicycle Adventure

  9. #34
    Dog is my co-pilot 2manybikes's Avatar
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    Quote Originally Posted by TromboneAl View Post
    I've calibrated my squeeze. I pumped a tire to 85 psi, squeezed it and noted "That's the point at which I need to add more air." I pumped it to 100 (my preferred pressure) and noted how it felt. I give myself a refresher course now and then. There's a small, but discernible difference.

    Thus, before each ride, I can do two quick squeezes and decide whether I need to pump or not.
    Don't ever have a coffee. Don't ever skip one. uh.....calibrate your perception too. Make sure you always have exactly the same perception. Don't get tired or energetic.
    [SIGPIC][/SIGPIC]

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