Just purchased a new set of tires for my 01 Discovery2 (General Grabber UHP). I had them to air up 28 front and 46 rear per the chart located on the door jamb. The service tech said they would wear quicker with 46 psi compared to 35 but rotating would help of course. Does everyone run 46 psi in the rear?

 

The specific PSI number isn't really terribly important. Obviously you want to be in the right general area, but exactly 46 isn't necessary. Just air up your tires till they're full but not too stiff. I have always eye balled my air pressure like this and when I check them I'm usually around 30 front 35 rear for a DI.

 

First of all, if you plan on any wheeling at all, you must have the tires at equal pressure.
Most of us in our club run at around 40 front and rear, better gas mileage tread will last longer and little or no strain on the t/cxase.

 

When you say wheeling I assume you mean off-roading? My driving is strictly city driving and an occasional 50 mile trip. You indicate the tread will last longer at a higher pressure?

Just curious....why do you think they list the rear pressure at 46 and front at 28?

Thanks for all of your comments.

 

All manufactures list a number that will give you the best ride without concern for gas mileage and wear, been that way for years.

 

Putting different PSI in front and rear make your tire wear off fast than going all same PSI. if you put less PSI in front. That tire will get more traction but will wear off fast.




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Tire pressure is properly determined by knowing the tire's requirement for a given load and how much load it's carrying. If you have more load on the rear tires than the front, you want more pressure in the rear.
The pressures given on the door jamb are for OEM tires. While close for others of the same size, design and load rating, you can't assume.
Short of calling the tire mfg and giving them the weight on each tire, the best way is to do a rolling pattern test. Chalk the tread all the way across then drive forward and look at the pattern left. It should be even all the way across. Adjust the pressure and repeat until you have an even pattern.
The highest pressure with a good pattern will give you the best mileage.