Tire Pressures

[JimLor]

Have only had one opportunity so far to take readings:

Temp (F) // Humidity // Bar Press // Front // Rear // %increase

Start 37.3 // 42% // 29.92 // 36 // 38.5 // 6.9

End 37.6 // 37% // 29.87 // 38.5 // 42.5 // 10.4

I used a "balls-on accurate" LaCrosse weather station and "balls-on accurate" digital tire pressure gauge (english and spanish don't ya know) to take these readings. I intend to increase tire pressure by 1 pound for each subsequent road test.

 

[timk]

I have heard that a cold tire originally pumped to 40 lbs should read 44 lbs when hot. Not sure of the increase %... but that will always be my rule of thumb if I check my tire pressure while they are hot.

That's the rule of thumb I used for bias tires, but I don't know if the radial's rolling resistance would make it less of an increase.

 

[nick]

How long does it take for the tyres to become "hot" and does it matter much what the ambient temp is ?

Thanks,

Nick