Coincidence?

[Steve]

With 28 in the front, I got a 10% delta after a nice spirited ride.
The rear with 32 psi, I got a 17% delta. Which should mean it was too hot and needs more air pressure. So I went up in 2 psi increments until I found a 10% delta which turns out to be 38 psi.

If you look back to your post #13, you mentioned that some believe the rear should have a 20% delta, and your 32 psi starting point put you pretty darn close.

Getting the EXACT correct pressure is a bit difficult, but how do you KNOW what is correct? If you don't have enough pressure, the tire will run hot and wear out quicker. If you have too much pressure, it won't deform enough and will tend to wear out in the middle, due to a smaller contact patch. Only religious pressure checking over the life of the tire will tell you what was correct, so you can make adjustments on your next tire.

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[Sandy]

If you look back to your post #13, you mentioned that some believe the rear should have a 20% delta, and your 32 psi starting point put you pretty darn close.

Getting the EXACT correct pressure is a bit difficult, but how do you KNOW what is correct? If you don't have enough pressure, the tire will run hot and wear out quicker. If you have too much pressure, it won't deform enough and will tend to wear out in the middle, due to a smaller contact patch. Only religious pressure checking over the life of the tire will tell you what was correct, so you can make adjustments on your next tire.

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Where's Posplayer when you need him? I'm sure he's got the formula somewhere in his head on how much heat is needed to expand the air in a tire by 20%. LOL. I certainly don't know but then I've never run a tire low enough nor loaded enough to find out. Pyrometer anyone?

[Rob S.]

Porno For Pyros

Pyrometer anyone?

Ask the Linseed guys. They might have one.

[Steve]

Where's Posplayer when you need him?

I contacted him a couple of weeks ago and pretty much asked him that same question.

He said he is working on a project at work and decided to take a break from GSR.

.

[Sandy]

Ok. Found some stuff on the net. Yeah I can be a bit OCD at times. A tire starting at 68°F would have to reach a temp of 122°F for a 10% increase. Sounds pretty reasonable. For 20% increase the tire would have to reach a temp of 176°F. Probably way too hot.

Formula is in C with totals converted to F.

50c+273c/20c+273c = 1.10 or 10% increase
80c+273c/20c+273c = 1.20 or 20% increase
20c = 68f, 50c = 122f, 80c = 176f

Google ......making dumb people seem smarter everyday. LOL.