31x10.5r15
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Laughing Gas
Joined: Jan 2023
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31x10.5r15
I ordered the wheels for the truck, so I'm going to repurpose this thread, with another question I have. The original tires for my truck were 235/75r15 I believe. I have 31x10.5r15 wheels going on it. The door sticker said 35psi for the front, and 41psi for the rear. With bigger tires is that affected? And can I air it down to make the ride better? If I air it down will the tire take more of the impact than the rim? I want to make sure the tires are aired properly for the wheels not to crack again. Don't know what it takes to crack a wheel, but someone cracked the steel rims that were on it. I also don't tow and I hardly will use the bed. The most I'll do is put 2 dirt bikes in the bed. So what would be a good PSI for the front and rear for a daily driver that doesn't carry or tow?
FTE Legend
Joined: Jun 2006
Posts: 31,930
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From: Ottawa, Ontario
Potentially. What you need to figure out is what pressure produces the widest contact patch and that is easy enough to DIY with some chalk. Starting with the tires at max pressure, put a chalk mark across the tread of one front and rear tire and move the truck a few car lengths so that the chalk begins to wear off. If the chalk line doesn't wear evenly across the tread reduce pressure 5-10psi and repeat the procedure until it does.
Hotshot
Joined: Sep 2001
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I have run 31 10.50 15 tires on these trucks since they were new and basically just run them at 34-36 psi on all 4 unless I'm hauling a load then might bump the rear up to 40 psi. With higher rear pressure and little weight the tires likely will wear down the center tread faster and ride quality will be bouncy. I believe most of the tires in this size and C rating are max psi of 50, but that is often confused with the recommended pressure since it is on the sidewall.
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Laughing Gas
Joined: Jan 2023
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I took it for alignment, and the shop said all of them are at 35. My little slime brand tire pressure thing reads 40 in both but my $10 pressure thing isn’t gonna be as accurate as a mechanics. So I’m gonna leave them at 35. I was also gonna ask. I kept the old wheel and tire. Will a 31x10.5r15 tire fit on the spare tire carrier under there without making new bolt holes in the frame? I don’t want the spare tire in the bed, so if I have to somehow make new bolt holes in the frame that’s what I’ll do. If it’s safe to do so.
Hotshot
Joined: Sep 2001
Posts: 11,958
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Get a good Milton pencil style tire gauge. Those cheapo parts store ones aren't the best esp the dial ones.
Yes, a 31 10.50 will fit on the spare wheel. I've had it on 3 trucks You need to loosen the forward mount to lower it a little. It may need penetrating fluid like Kroil or PB Blaster. Always just bought the cheapest 31 the tire shop had.
Yes, a 31 10.50 will fit on the spare wheel. I've had it on 3 trucks You need to loosen the forward mount to lower it a little. It may need penetrating fluid like Kroil or PB Blaster. Always just bought the cheapest 31 the tire shop had.
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