I wonder if a simple digital read meat thermometer would work applied to the 
tire groove? It prvides a rapid read out in small fractional increments. Worked 
great for our "London Broil" last night.(Do they actually make "London Broil" 
in London? I suspect not.
Paul,Evanston

Sent from my iPad

On May 27, 2012, at 3:22 AM, Martyn J Culling <[email protected]> 
wrote:

> Gerry
> 
> My 4/4 is supposed to be 18 or 19 (can't remember which now) on 165/82 x 15". 
> I run 22 front, 23 rear. 28 on track is absolute minimum pressure, with 30 
> aimed for on a hot day. I've used anything from 165 wide to 195 and oddly, 
> the pressure needs seem to be about the same.
> But if I used the higher pressure on the road, I'd wear the middle of the 
> tread out. And so I suspect would you.
> 
> There is a technique involving a concrete floor and wetted tyres to assess 
> the tyres contact area but interpreting the results is not accurate or easy, 
> just gives a rough idea. Tyre heat can also be a guide if you have access to 
> an accurate pyrometer. 
> My gut feeling remains this is too high a pressure for the road, even if I 
> accept your car probably weighs more than mine. (4/4s got heavier from early 
> 70's on).
> 
> rgds Martyn 
> 
> On May 27 2012, Gerald Wallace wrote: 
> 
> 
> My 4/4 has 195/60 X 15 tyres, the recommended pressure is 22psi. For the 
> recent BHM trackday I increased this to 28 all round. After the track time I 
> drove back home on this higher pressure. What are the pros and cons of using 
> higher pressures on the road and what do you Mogtalkers run at?
> Gerry. 
> 
> 
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