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How long for tires to acclimate to cold?

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How long for tires to acclimate to cold?

Old 01-03-18, 10:18 AM
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How long for tires to acclimate to cold?

I don't really know how to phrase the title well. When I went out last weekend, I set tire pressures to 5# in the parking lot. The bike came from a warm house, and was on the outside of the car for maybe 20 minutes on the drive there. I took pressures post ride, and the tires had dropped down to 4.25# after about 50 minutes of riding. Only reason I bothered to check is that they were dragging quite a lot at those pressures, they were too low.

I assume the difference came from the tires not being completely cool when I set pressures, and losing some pressure as they further dropped. Has anyone else noticed this, and if so, how long do you let tires acclimate to cold before trying to set the pressure accurately?
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Old 01-03-18, 10:39 AM
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Yes, pressure will drop with temperature. A few years ago Bontrager published a chart that estimated how much pressure would drop based on temperature change and tire volume. You may still find it somewhere.

But for the most part, if you pump them in the garage and it is cold outside . Pump them harder than you usually would.
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Old 01-03-18, 11:31 AM
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Guy-Lussac's Pressure Temperature Law for the change in pressure as a result of temperature within a constant volume (assuming the tire/tube dimensions don't change with changing temp or pressure).

P(ressure)/T(emperature in Kelvin) = Constant

Assuming 59F/15C/288K indoor temperature and 5F/-15C/258K outdoor temperature, therefore

5psi/288K = xpsi/258K

xpsi = (5psi x 258K)/288K

xpsi = 4.5psi

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