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  1. #1
    Senior Member cyclezealot's Avatar
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    Normal Tire pressure loss following a ride.

    I am in the habit of checking tire pressure each ride... Should I need air, i'd rather do it with the floor pump at home... My clue as to a potential minor leak is how much air one looses during a 20 mile plus ride... Normally , It is like 3-5 lbs... For quite some time, on my commute bike the front has been loosing 7-10 lbs. range and the back less than 5. But, it has been quite some time.. And so far, it has not gone flat.. How much air do you expect to loose during a ride and has it any significance.
    Pray for the Dead and Fight like Hell for the Living






    ^ Since January 1, 2012

  2. #2
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    Quote Originally Posted by cyclezealot View Post
    How much air do you expect to loose during a ride and has it any significance.
    Depends on how much beans i been eating. Sorry couldn't resist

  3. #3
    Senior Member staehpj1's Avatar
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    Quote Originally Posted by cyclezealot View Post
    I am in the habit of checking tire pressure each ride... Should I need air, i'd rather do it with the floor pump at home... My clue as to a potential minor leak is how much air one looses during a 20 mile plus ride... Normally , It is like 3-5 lbs... For quite some time, on my commute bike the front has been loosing 7-10 lbs. range and the back less than 5. But, it has been quite some time.. And so far, it has not gone flat.. How much air do you expect to loose during a ride and has it any significance.
    It depends a lot on what pressure you are running and how wide the tires are. Also tubes vary. That said I would think that on a 20 mile ride you should lose more by checking them with a gauge than you lose by any leakage. I would say that even on my high pressure narrow tires I don't lose an amount that I can reliably measure in a 20 mile ride. It takes mine a couple days to lose 3-5 pounds whether riding or parked.

  4. #4
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    My 700x23 road tires and tubes seem to be very tight as well with 120 PSI. I always release and repump before every ride, but when I check they are usually over 110 PSI.

    But I am new and not an expert.
    Old enough to know better and old enough to forget that I do.

  5. #5
    Senior Member Febs's Avatar
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    I inflate my rear tire to 120 psi and my front to 110 psi before every ride. When I re-inflate before the next ride, they're usually each at around 95-100 psi.

  6. #6
    rebmeM roineS JanMM's Avatar
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    Quote Originally Posted by bakerjw View Post
    My 700x23 road tires and tubes seem to be very tight as well with 120 PSI. I always release and repump before every ride, but when I check they are usually over 110 PSI.

    But I am new and not an expert.
    You let air out and then pump them up again? Why?

  7. #7
    Senior Member staehpj1's Avatar
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    Quote Originally Posted by Febs View Post
    I inflate my rear tire to 120 psi and my front to 110 psi before every ride. When I re-inflate before the next ride, they're usually each at around 95-100 psi.
    How much time between rides?

  8. #8
    Senior Member cyclezealot's Avatar
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    ^. As for me, I often ride 5 days out of 7. RIght now the bike in question is my local commute bike. 700 x 28... I'd say most of my tubes are almost always Performance's butyl, non - thin tubes.
    Pray for the Dead and Fight like Hell for the Living






    ^ Since January 1, 2012

  9. #9
    aka Phil Jungels Wanderer's Avatar
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    I find that I lose 5-10% over a 24 hour period. This is for a tire inflated at 85 psi or above. The lower the normal pressure, the less it will lose over time. Seems like I lose more when the air is warmer outside.

    Seems like them little molecules of air sneak out better under pressure.....

  10. #10
    Senior Member Febs's Avatar
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    Quote Originally Posted by staehpj1 View Post
    How much time between rides?
    I've been riding 4-5 days per week, so usually 24 hours, sometimes 48.

    I should also mention that I have two bikes, one with 700x23 tires, and the other with 700x25. Both are rated for 120 psi, and my experience with each has been similar.

  11. #11
    STFD mcgreivey's Avatar
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    Quote Originally Posted by JanMM View Post
    You let air out and then pump them up again? Why?
    Why, because fresh air is livelier than the old stagnant air that's been cramped-up in your tire for a week. Old air is restless, and trying to escape; fresh air is less jaded.

  12. #12
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    If you filled up with CO2, it'll lose pretty quick. The stuff bleeds through the rubber in the tube.
    -------

    Some sort of pithy irrelevant one-liner should go here.

  13. #13
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    Quote Originally Posted by JanMM View Post
    You let air out and then pump them up again? Why?
    I don't let it all out. Just bleed off a bit.
    Old enough to know better and old enough to forget that I do.

  14. #14
    rebmeM roineS JanMM's Avatar
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    Quote Originally Posted by mcgreivey View Post
    Why, because fresh air is livelier than the old stagnant air that's been cramped-up in your tire for a week. Old air is restless, and trying to escape; fresh air is less jaded.
    That sounds reasonable. I want the air in my tires to have a good attitude.

  15. #15
    rebmeM roineS JanMM's Avatar
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    Quote Originally Posted by bakerjw View Post
    I don't let it all out. Just bleed off a bit.
    What purpose does the bleeding-off serve? Just curious.

  16. #16
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    Quote Originally Posted by JanMM View Post
    What purpose does the bleeding-off serve? Just curious.
    If I don't give my QBP valves a good burp before reinflating they don't like to let the fresh air in.

  17. #17
    BeaverTerror Yan's Avatar
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    I haven't filled my tires in two weeks. I commute 30 miles a day.
    Yan

    2013 True North custom touring; 2010 Novara Randonee; 2009 Unicycle.com Club 24"; 1989 Miele Tivoli; 1979 Colnago Sport

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    three to five psi lost in a single ride seems high to me, but nowhere near disastrous (I check at the beginning of a ride but not at the end, so I don't actually know how much gets out). Time seems to be more of a factor than miles--I lose a few pounds over a few days whether I ride the bike or it sits in the garage. FWIW, I think the idea that you're losing more air in the checking process than through a small leak is probably accurate, but it's easy enough to put the inflated tube in a sink or big pot of water and look for bubbles if you suspect trouble.

  19. #19
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    You should not lose ANY air over a four or five hour period unless there is a leak in the tube or valve. Temperature differences can make it seem as if you have lost air. If you are riding at 90 degrees at the beginning of a ride, but at 70 degrees at the end of the ride, the PSI reading might be a tad lower...not from loss of air, but from the cooler temperatures.

  20. #20
    CAT4 joe_5700's Avatar
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    Quote Originally Posted by alanbikehouston View Post
    You should not lose ANY air over a four or five hour period unless there is a leak in the tube or valve. Temperature differences can make it seem as if you have lost air. If you are riding at 90 degrees at the beginning of a ride, but at 70 degrees at the end of the ride, the PSI reading might be a tad lower...not from loss of air, but from the cooler temperatures.
    Has any considered that there is some leakage that occurs when putting the pressure gauge on the valve there is some tire pressure lost? Also, what kind of gauges are you using? Digital?

  21. #21
    Senior Member deraltekluge's Avatar
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    My tires lose about 10% of their pressure per week, whether they're 50psi tires on a mountain bike, or 100psi tires on my trike.

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