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Tire pressure in warm tires

Old 07-22-2010, 02:49 PM
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Tire pressure in warm tires

Does anyone have a good way to air up tires that are already warmed up?

I don't have a compressor so I have to drive to a gas station to air up my tires. I know doing this warms them up and increases the pressure in them, but I don't know by how much.

I guess I could always go air up to 5 or so psi above recommended then drive home, park overnight and bleed off the excess pressure in the morning. Just looking for an easier way for when I happen to be at a gas station with free air, which is very rare where I live.
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Old 07-22-2010, 03:03 PM
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That is terrible on tires.. I have had this same problem (after moving) and not having the shop se t-up (three phase compressor not wired) I went to local auto parts store, and bought a five gallon air bottle. I take it by the local gas station / pressure it up to 125 psi and that holds for a least a couple of months riding..
Think the bottle costs around 15-20 dollars.. See ya....
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Old 07-22-2010, 03:26 PM
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You can always use a bicycle tire pump.......
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Old 07-22-2010, 03:49 PM
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My '73 R75 BMW came with a hand pump.
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Old 07-22-2010, 04:11 PM
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Originally Posted by zwoehr View Post
. Just looking for an easier way for when I happen to be at a gas station with free air, which is very rare where I live.
Do you mean you have to pay at the gas station to put air in your tyres?
Your gas stations donīt have air/water for free?
I canīt imagine this. Here everyone have air/water for free.
Thatīs odd
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Old 07-22-2010, 04:16 PM
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I would say you can get free air at about 5% of gas stations.
As for free water...I don't ever remember that!
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Old 07-22-2010, 05:37 PM
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i dont understand that question. sure when a gas in compressed its heats up but were talking a minuscule amount when your only going to around 40psi. or are you saying you have a leak? you shouldnt need to be filling your tires up often. and like 8541hawk said just use a bicycle pump.
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Old 07-22-2010, 07:02 PM
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Racers deal with this issue all the time. 3-5 lb increase on a hot tire wouldn't be out of line. Maybe you should fill it and after it cools check the drop or check it cold and run it until it's hot and recheck.
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Old 07-22-2010, 07:55 PM
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Buy an air tank (Walmart, Sears, Autozone, etc) and a good air gauge with a bleed valve. The cheap pressure gauges are good for a rough estimate at best. Unless you have a leak issue, your tires should maintain pressure for a good part of the riding season, but it's still a good idea to check them regularly.
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Old 07-22-2010, 08:31 PM
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How far are you from the gas station? If it's only 1 or 2 miles, as long as you go easy on the throttle getting there, no problem. Air them up to your desired pressure.
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Old 07-24-2010, 07:19 PM
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How do you know how much air you have at home. If you check the pressure at home, then get to the gas station, check them there, you'll know the difference, then add air as needed. Simple.
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Old 07-24-2010, 09:33 PM
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Originally Posted by thetophatflash View Post
Racers deal with this issue all the time. 3-5 lb increase on a hot tire wouldn't be out of line. Maybe you should fill it and after it cools check the drop or check it cold and run it until it's hot and recheck.
I worked in the tire business for 8 years and I can tell you that 3-5 psi is about right.
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Old 07-25-2010, 08:53 PM
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Originally Posted by wshski View Post
How do you know how much air you have at home. If you check the pressure at home, then get to the gas station, check them there, you'll know the difference, then add air as needed. Simple.
that's right>common sense. I've run for an hour fairly hard, got off the bike and checked immediately and saw 4-5 lbs increment.
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