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Old 10-17-2012, 10:35 PM   #1
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Understanding Your Truck Tires 2

Called Discount Tires and the P255/70R18 are the tires the Toyota installed from the factory. I'm not confident this is an OK thing. This tire is rated "P" for passenger and yes I did verify the door jam sticker. In my humble opinion (and yes I know what they say about opinions) the tire should be a "LT" rated tire. My Tundra can pull 10,500, that in it's self quantifies a truck not "P" for passenger. This is amplified by the "SR5/TRD" in my book. Some my say that pumping the air pressure to 44psi will quantify the "max load rating", but still..... please.... where's the safety? Web surfing at NTB doesn't even show this size tire. According to NTB it should have P275/65R18, wait for it........ yep still got that "P" rating.
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Old 10-17-2012, 11:17 PM   #2
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You should be able to find a higher rated tire in that size. Look at nitto's, toyo's and Handkooks. They seem to have higher load ratings for larger wheel sizes. While I would want a load rated ( C,D,orE) tire look at the sidewall. All tires have the pound rating on the sidewall with the max psi usually following( such as. 2450lb at 44psi max cold) . If you are with in the listed ranges you should be safe but keep an eye on them. And if they are getting close to the 5 year mark I would be very carefull.

Ps. Most semi's are running very close to tire max psi s when loaded, sometimes over but their tires also have very little flex and they usually are not very old.
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Old 10-17-2012, 11:26 PM   #3
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Oh and I looked this up for another post a couple days ago on 1010tires.com s tire calulator

255/70/18 has a width of 10.03" and are 32.05" tall

275/65/18 has a width of 10.82" and are 32.07" tall

Roughly the same tire, the 275 is about 1/2" wider and .02" taller. It would be very hard to tell any difference if they were put side by side on new tires and being wider is not going to change any of your computers calculations( for speed, braking and such).
Hope this helps!
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Old 10-18-2012, 12:48 AM   #4
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Forget about the P metric tires...I seem to recall that you're pulling a Rockwood or Flagstaff 5th wheel with it. Get a set of Michelin M/S 2's load range E...you'll notice a big difference in stability when towing.
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Old 10-18-2012, 04:55 AM   #5
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P rated tires are great for driving and occasional "carrying."
They are a liability if you are serious about towing.

Ditto the Michelin M/S2 D or E rated (depending on your truck).
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Old 10-18-2012, 09:09 AM   #6
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Your tires are good & would work well for 90% of the pickup trucks that run up & down the highway with nothing in them. The problem occurs when you load it. Take a good look at how much weight you are putting on your truck by weighing your truck loaded with the trailer wheels off the scales. It would be even better if you could get just the rear wheel weight on the loaded truck. I don't think you can go wrong by putting truck tires on. When I replace my BFG's on my Tundra, they will be truck tires. The sidewalls are reinforced & the ride will be a bit ruffler. I switched custom van passenger tires to truck tires simply because it was too much weight with a new heavier TT added.

When I was stationed in Germany, you could not put passenger tires on a van or a truck, & passenger tires had have the speed rating appropriate for the car you are putting them on. It makes sense to me.
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Old 10-18-2012, 09:28 AM   #7
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For the factory installed Bridgestone Dueler H/T 684 II P255/70R18. What should the tire pressure set at when running loaded (Cargo Cap 1900lbs)? The max setting is 44psi., Is common to inflate to max during transit and then deflate to standard 32psi after setting up?
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Old 10-18-2012, 09:55 AM   #8
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My Tundra came with BFG Rugged Trail T/A with a max of 2601 lbs at 44 psi. If I was going to put on a heavy load it would be at or near 44 psi & then let it out to 32 psi for normal travel. My truck load & TT is very light so 32 psi works for towing.

Get yourself a good tire pressure gage too. Most are not very accurate. You don't need the racing quality unless you have extra $$ to burn
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Old 10-18-2012, 10:11 AM   #9
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Dave, Did the web surf thing on the Michelin M/S 2's. For the 18" rim it came up as a P245/60R18 rated "XL" still got that "P" rating. This size tire drops the tire height 3" and I lose .4" in width. Additionally, no gain in mileage 60K.
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Old 10-18-2012, 10:17 AM   #10
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Same boat here with my Chevy. P265/65r18. Those can be found in a heavy ply just have to check dimension difference.
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