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Blame the LBS?

Old 08-31-12, 05:45 PM
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ChrisCar
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Blame the LBS?

I recently had new tires, tubes, and tape installed on both my wheels. What I've been noticing is that my tires(700c) will lose about 20psi over the course of the week. Is this normal or should I be inquiring the bike shop to redo the tape and tubes?
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Old 08-31-12, 05:52 PM
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Bill Kapaun
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You'll still lose 20 lbs. per week.

My 28MM tires lose that in 2 days.
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Old 08-31-12, 05:54 PM
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Normal. Yes.

I pump my tires up before every ride.

You should do the same.
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Old 08-31-12, 05:55 PM
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Tire bleed is perfectly normal, with narrower higher pressure tires bleeding faster than fatter low pressure tires. 20psi/week for 700c tires seems about right.
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Old 08-31-12, 05:55 PM
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Bike tires, due to their small volume and high pressure, lose pressure far, far faster than car tires. Your experience is completely normal.
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Old 08-31-12, 05:56 PM
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I don't know.

It's normal for bicycle tires to lose air pressure over time but 20 psi per week sounds to me to be on the high side of normal. If they did something wrong, like pinching a tube for example, it will get noticeably worse. If it was my bike I'd probably just top up the tires every time that I ride and not confront the bike shop unless it gets worse.
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Old 08-31-12, 05:58 PM
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Originally Posted by Retro Grouch View Post
It's normal for bicycle tires to lose air pressure over time but 20 psi per week sounds to me to be on the high side of normal.
Not to me. Typically my 700-23 tires will loose about 10 psi in two to three days from an initial 110 - 120 psi so 20 psi/week seems quite reasonable.
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Old 08-31-12, 06:14 PM
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Great, Thanks for the information.
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Old 08-31-12, 06:18 PM
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Just the act of applying a tire gauge and measuring the pressure will result in some lost air, as will "burping" a Presta valve. With small high pressure tires that apparently small air loss can cause a significant loss of pressure. Try measuring your tires 3 or 4 times in a row and see how much pressure you lose just by measuring it, the results may surprise you.
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