Correct tire pressures

MOST people under inflate the fronts and overinflated the rears. Even running what the front calls for can cause the edges to wear, my experience is to inflate 10 psi over what the weight/inflation chart calls for based on your actual tire load. I have found adding 5spi to the rears is the best also.

Groover wrote:

mike-s wrote:

Chris Bryant wrote:
Something I found interesting- just had my car safety inspection, and they gave me a readout if tread wear- I have the tires - Michelin Defender- inflated 2 psi over the listed inflation, yet the readout showed shoulder wear, indicating under inflation.

Both edges? Because, outside edge wear is toe or camber. Underinflation would cause both sides to wear.

Edge wear can also be caused by cornering forces. Also, inflation pressure is not an exact art and gauges are exact either. I would probably try a few more PSI in the tires and watch the speed on corners.

Yes, you should be aware that steering tires tend to wear both shoulders and drive tires tend to wear the center. On a FWD, the front tires do both, so they tend to wear evenly, but you can really see the difference on a RWD.


Also, radial tires tend NOT to show wear due to underinflation/ overinflation because of the belts.

mike-s wrote:

Chris Bryant wrote:
Something I found interesting- just had my car safety inspection, and they gave me a readout if tread wear- I have the tires - Michelin Defender- inflated 2 psi over the listed inflation, yet the readout showed shoulder wear, indicating under inflation.

Both edges? Because, outside edge wear is toe or camber. Underinflation would cause both sides to wear.

Edge wear can also be caused by cornering forces. Also, inflation pressure is not an exact art and gauges are exact either. I would probably try a few more PSI in the tires and watch the speed on corners.

Of course, with the HD package that came with my 2014 F150, the OEM tires were LT's. LT245/75R17E's to be exact. The yellow tire sticker on the door recommends 55# psi in the front tires, and 60# psi in the rears.

Wonder if Ford would recommend inflation numbers on non OEM tires?

me.camper wrote:
I just got a 2013 f150 3.5 ecoboost and would like to get some LT tires for it. Anyone have a load range rating recommendation? Also what do you run for pressure with that load range tire on a half ton. Thanks any info is appreciated.

Chris Bryant wrote:
Something I found interesting- just had my car safety inspection, and they gave me a readout if tread wear- I have the tires - Michelin Defender- inflated 2 psi over the listed inflation, yet the readout showed shoulder wear, indicating under inflation.

Both edges? Because, outside edge wear is toe or camber. Underinflation would cause both sides to wear.

I have michelin tires E rated in 245/75R17 size and I run them at 60psi in the rear and 45psi on the front when towing.

Chris Bryant wrote:
Something I found interesting- just had my car safety inspection, and they gave me a readout if tread wear- I have the tires - Michelin Defender- inflated 2 psi over the listed inflation, yet the readout showed shoulder wear, indicating under inflation. I'm running 35 psi now (32 psi recommended), will bump it up to near 40.
This is a passenger auto, obviously.

Underinflation is only 1 cause of outside tread wear.

Get the "E" tires as that will help a LOT with stability towing a TT !!! Weigh your rig loaded and unloaded, use the weight/inflation chart and add 5psi to rears and 10 psi to fronts.

Something I found interesting- just had my car safety inspection, and they gave me a readout if tread wear- I have the tires - Michelin Defender- inflated 2 psi over the listed inflation, yet the readout showed shoulder wear, indicating under inflation. I'm running 35 psi now (32 psi recommended), will bump it up to near 40.
This is a passenger auto, obviously.

I've got Michelin LT E rated tires ( Defender tires I think ) on my 2013 ECO. 6000lb loaded trailer.

I run 40psi not towing and 55psi towing. Does great.

I guess you will get more stiffness at max pressure when towing but I don't think I need 80psi.