Ratbert
Well-Known Member
I'm not sure what Alabama has to do with tire pressure, but they'll go up, not down in the summer.
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Rogersocal
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I have 37" (17 ")and run 33PSI on road but 12PSI off road
Radiate
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That's what I said. In Alabama tire pressures shoot up throughout the day due to the ridiculous heat. I didn't say anything about pressure dropping due to weather. It rarely gets cold enough here for decreased pressure.
zouch
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20s are kinda' weird for a J**p; unless it's just to be looked at, 20s are going to make it *awkward* to do what it's for with that tiny bit of sidewall.
that said, to determine road pressures, try the 10% Rule checking to see how much tire pressure varies when in use.
start with a Cold pressure (from sitting at rest out of the sun for at least a couple of hours) and then see how much the pressure rises when being driven for a long while. it pressures rise more than about 10%, you're getting too much sidewall flex creating heat, and your starting Cold pressure was too low.
monitor and adjust as necessary.
i have no idea if any pressures might work in the sand for a 20" wheel; i don't know that you're ever going to be able to get it into the single-digits where you get the 'snail foot' profile that's the most benefit in sand with that tiny sidewall.
that said, to determine road pressures, try the 10% Rule checking to see how much tire pressure varies when in use.
start with a Cold pressure (from sitting at rest out of the sun for at least a couple of hours) and then see how much the pressure rises when being driven for a long while. it pressures rise more than about 10%, you're getting too much sidewall flex creating heat, and your starting Cold pressure was too low.
monitor and adjust as necessary.
i have no idea if any pressures might work in the sand for a 20" wheel; i don't know that you're ever going to be able to get it into the single-digits where you get the 'snail foot' profile that's the most benefit in sand with that tiny sidewall.
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