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Old 07-06-2019, 01:35 PM   #25
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Cool Re: For Anyone Who Owns a Digital Tire Gauge

Originally Posted by CapriRacer View Post
That would seem to confirm that it is the 15" option that has the pressure split

Oh, if it were just that simple. The tire manufacturer is the one who decides what max pressure is to be imprinted and he is constrained to use those 3 pressures, and by the speed rating. You will find S and T rated tires with a max pressure of 44 or 51 psi, even though the speed rating test is performed at 35 psi.

No, this is the height of capitalism. Making money off of selling information.

No, the formula you shared is tantalizingly close. It just uses some faulty assumptions. The result it provides will be within shouting distance of what it would get if it hadn't made those assumptions.

Then there is the issue of what people like in the way of vehicle handling. When I was calling on Ford, I talked to the ride engineers - the ones the specify the spring, shock, and sway bar settings. Their job was to ignore their own preferences and delivery a product that met the goals as determined by the management team. But one of the items NOT on the agenda was tire pressure. That had been predetermined based on a procedure the company had loads of experience with.

However, that result of tire pressure, spring rate, sway bar size, and shock damping didn't always appeal to every driver and it is common for folks to tune their car by using a tire pressure different than what is on the vehicle tire placard. The danger is not using enough tire pressure - which increases the risk of a structural tire failure - or using too much that wet traction is significantly reduced.
ZZZZZZ....zzzzzz-snorrre..zzz- Whoa, WAIT - Oh!

Where am I, what day is.. Oh!, how was your Fourth?

We just had our off-Site storage guy come for a pick up with his 2019 Nissan NV150 van.

Tires: LT245/70R17E, Max load 3000lbs, 2,755lbs 'dual' - assuming that means four per axle? Max cold pressure on tire 80psi. These tires match the B-pillar placard, of course probably OEM since the thing is less than one year old.

Anywho, ran my trusty-rusty formula for this van in its four-tire config., and got the following:

B-Pillar sticker on the van recommends: F 50psi, R 80psi, cold.

My calculations: F 51psi, R 78psi.


Do you know what that means, Capri?...

Last edited by RidingOnRailz; 07-07-2019 at 07:18 PM.
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