Hot Rods 32 Highboy Tire Pressure

I think I've asked this before but can't find the answer. I have 285/70R15 BFG's on the back of my 32 Ford sedan highboy. I remember there were several opinions but what was the tire pressure you guys decided was optimal?

 

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Mike

 

I'd try 25 psi and see if you like the ride.

 

Prather. I think you told me that before? That's where I was heading. Thanks.

 

In general, the lighter the weight on the axle, the less inflation pressure is required. It's about 'tire deformation'.
There may be a pressure chart that someone has figured out......
but don't ax me where that may be found.

 

Trial and error.
Load the car up to the "normal" driving weight on a flat concrete floor.
Spray the full tire width with water (moist, not dripping wet) and roll the car forward a couple of revolutions.
What you want is a nice uniform tread print across the whole tire width.
Make sure you have driver/passenger weight in the car when testing.

 

What i do on all my stuff is to put a strip of 3/4'' masking tape across the tires and go for a drive on a straight road and stop every 200yds or so and see where the tape is wearing off, in the center is too much pressure and on the outer edges too little and so on. With this method you can get it exact. JW

 

great post,i've always done it with side walk chalk...tape idea seems way easier....thanks...

 

My avatar hi-boy with Coker "American Classic" bias look radials (5.60R15 front, 8.20R15 rear) runs 29 psi front, 24 psi rear. The car weighs around 2,500 lbs. Ride and tire wear is very good, about 18,000 miles on tires.

 

I read this many years ago and have followed it with success since. I believe that it was from Michelin, but could be wrong, ask my wife. A radial tire should gain 4 Lbs going from cold to hot from a several mile drive. If it gains less, it was overinflated, if more than 4 it was under inflated. Works for me.