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984x4 dak
Dodge Dakota
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11/13/2003
01:19:42
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 Subject: tire pressure
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Message:
Just got a set of BF Goodrich 31x 10.5 15's for my truck everyone tells me to use the tire pressure on the door jamb but it is for the smallest friggin tire you can put on. I see the max pressure is 50 psi on these. I live in Michigan and am getting ready for the snow. I drive predominately on the roadway. Can anyone help me out. The place i bought them from told me to look on my door jamb as well. WHAT DOU YOU RECOMMEND!!!!!!!
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.boB
Dodge Dakota
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11/13/2003
12:57:23
| RE: tire pressure
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Message:
The data on the dorr jamb is there for the stock tires ONLY. For anything else it's probably a good starting point, but not exactly accurate. Tire pressure varies with conditions: speed, weight, temperature, surface type etc. So any pressure you set will be a little bit of a comprimise amongst all these. Same for the factory tires, they just don't tell you that.
Your goal is to ensure that there is pretty much even pressure and road contact across the width of the contact patch. If grossly overinflated, the tire will balloon and only contact the road surface in the center. If grossly underinflated, just the opposite will happen and it will only contact at the outside edges. There are three ways I know of to set accurate tire pressure, listed here from best to least:
1. Pyrometer testing. Run in a straight line for a while, 5-10 miles. Then check tire temps. Should be even across the contact patch.
2. The Chalk test: After tire is hot, Run a couple of chalk lines across the tread. Then drive a short distance in a straight line. Look at the chalk lines closely, the wear should be even across the entire line.
3. Watch the tires for uneven wear. Adjust pressure as needed to correct this.
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Dally
Dodge Dakota
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11/13/2003
22:05:55
| RE: tire pressure
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Message:
The Straight answer that you are lookin for is 30PSI. I have these very same tires on my 2000 Dak. Central Canada cold weather is -40F, and 30PSI (cold) is the correct answer.
You can run em up to 35, but the ride gets rough, the traction starts to deminish, and they will wear in the middle of the tread. If you go extreme offroading, drop the preasure to about 16-18 PSI (while on the trail and inflate B-4 you hit the hwy) You'll catch a little better traction while climbing. Good luck
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98 dak 4x4
Dodge Dakota
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11/14/2003
04:30:37
| RE: tire pressure
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Message:
Thanks DALLY for the information. This is my first winter with these and am looking forward to seeing how they run....
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98 dak 4x4
Dodge Dakota
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11/14/2003
04:30:46
| RE: tire pressure
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Thanks DALLY for the information. This is my first winter with these and am looking forward to seeing how they run....
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98 dak 4x4
Dodge Dakota
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11/14/2003
04:46:39
| RE: tire pressure
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What about on dry pavement? Should the tire be this low for everyday dry pavement ?????
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Dan
Dodge Dakota
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11/14/2003
07:46:46
| RE: tire pressure
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Message:
I have stock 31's on my 97 on 15" rims. The door says 32 or 35psi front and rear (can't remember). Also, unless you change drastically in tire size, always go by what the door says, or somewhat close to it. The max written on the tire is just that, the MAX! Tire shops will tell you to go by the door jamb (they do). Yeah 50 psi might be the max safe pressure, but your ride quality will be very bad.
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CJ
Dodge Dakota
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11/14/2003
10:34:56
| RE: tire pressure
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I don't have the bfg's but I put a set or 31/1050/15 Goodyear MTR's on my 97 and in the summer I was running 40psi up here in michigan...but we shall see if I change my mind for the winter
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Kowalski
Dodge Dakota
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11/14/2003
16:00:49
| RE: tire pressure
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Message:
I run those tires in a smaller size in the winter on 7" rims; and that size but different tires the rest of the year on 8" rims. Another school of thought is that best gas milage and winter traction requires higher pressures. I run 50 psi front and 40 psi rear and get even wear patterns on both sets of tires. If you go over 40 psi in the back the rear wants to step out on bumps in turns unless you are carrying a load. You could safely experiment between 30 psi and what I run to find what you like.
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