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Tire pressure
- Thread starter Cduncan5
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- '20 Raptor, '22 Explorer ST, '14 GT500, '03 F150
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- 2020 Explorer ST, Silver Spruce Metalic
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- '20 Raptor, '22 Explorer ST, '14 GT500, '03 F150
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Oh, ok! That must be where the confusion comes from. I looked for an answer to this question a while back and some said to go by what the manufacturer puts on the tire and others said to go by what's on the door. I called Townfair Tire and a local shop (Rolands Tire) and they both said to go by what's on the door. But I get what your saying here. It's an altogether different set up than stock so therefore you would go by what's on the tire. That makes sense. So now, my tires say 36 psi. They are not the stock Michelin tire but are the stock size. Should I inflate to 33 or 36 psi?
Easy answer. You go by weight on each tire
And compare that to the manufacturer tire inflation guide.
If your on stock tires, the door jamb sticker is first guide
But anything different, you follow the respective tire manufacturer Inflation tables.
You need to weigh the vehicle and get accurate axle weights, in normal loaded setup
Then divide front axle in half and rear axle weight in half to get respective tire loading
You could do an all four weighing, but axle weight is faster route
Then compare the weight the tire is supporting to the recommended inflation at that particular manufacturer data
For example
If a tire has a load rating of 4k at max psi
But your only in the 2k range, then of course your cold pressure will be less
And you can also chalk your tread about 1/3 of circumference then slowly roll fwd on smooth surface like concrete or similar
And then look at the contact patch the chalk left behind
Then adjust psi to give you an even across tread contact.
And unless your vehicle is 50. 50 front and back
Then each axle will have different psi
My f150 carries normal heavy up front compared to rear
Rears run 31 and fronts 36
To maximize tire wear and pavement contact
And LT tires will be harsher. Because of sidewall layout
And load actually on the tire
And compare that to the manufacturer tire inflation guide.
If your on stock tires, the door jamb sticker is first guide
But anything different, you follow the respective tire manufacturer Inflation tables.
You need to weigh the vehicle and get accurate axle weights, in normal loaded setup
Then divide front axle in half and rear axle weight in half to get respective tire loading
You could do an all four weighing, but axle weight is faster route
Then compare the weight the tire is supporting to the recommended inflation at that particular manufacturer data
For example
If a tire has a load rating of 4k at max psi
But your only in the 2k range, then of course your cold pressure will be less
And you can also chalk your tread about 1/3 of circumference then slowly roll fwd on smooth surface like concrete or similar
And then look at the contact patch the chalk left behind
Then adjust psi to give you an even across tread contact.
And unless your vehicle is 50. 50 front and back
Then each axle will have different psi
My f150 carries normal heavy up front compared to rear
Rears run 31 and fronts 36
To maximize tire wear and pavement contact
And LT tires will be harsher. Because of sidewall layout
And load actually on the tire
Last edited:
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- East Freetown, MA
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- 2020 Explorer ST, Silver Spruce Metalic
- Messages
- 1,578
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- 764
- Points
- 162
- Location
- Nevada
- Vehicle
- '20 Raptor, '22 Explorer ST, '14 GT500, '03 F150
Since the tires are much higher load range, run the stock tire pressures as those pressures are for the expected loads. Yes, the tires can handle MUCH higher loads and pressures, but thats simply overkill for the vehicle. Stock pressures will feel even harsher than stock due to the stronger sidewalls of the LT tire, even though they're taller. The best thing is to ditch those ridiculous tires.
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OP
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#16
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