What tire pressure is best?
- Thread starter Dadstoy
- Start date
Dadstoy
New member
Sorry I forgot to add that I have a SR5.
What size tires are you running and are you quoting the onboard computer or doing your own math at the pump? Any other lift mods?
Dadstoy
New member
Doing my own math at the pump. 3 inch lift and 285 just like everyone else.
Doing my own math and considering our trailer hitch mods.....I too have 285's but no lift. Getting average 19.5, 60% city 40% Hwy. Very pleased.
Dadstoy
New member
Well the first tank of gas doing the math, I got 16.95 MPG doing 70.
The second tank was 17.25.
Total miles was 1,893 and 9 states.
Wish I would of got better mileage, but all and all the Runner was awesome. Very very happy with my Runner! This was my first long road trip and there will be more to come.
The second tank was 17.25.
Total miles was 1,893 and 9 states.
Wish I would of got better mileage, but all and all the Runner was awesome. Very very happy with my Runner! This was my first long road trip and there will be more to come.
Welcome home and happy you made it back safe. Yea, what you got seems within reason. You might even get better mileage as the engine breaks in some more. Who knows.....
I'm really confused. My BFG A/T tires say 65 PSI on the sidewall, which is what the shop that installed them put them at and told me to inflate them to. Reading this thread makes me wonder if I've got them over-inflated.
I ran them down to 40-ish PSI and felt the ride was a little mushy, but at 65 PSI the tires are like a rock. I haven't had them long enough to experiment with different pressures, but I also don't know what they should feel like, as I've never owned a vehicle with LT tires before.
I ran them down to 40-ish PSI and felt the ride was a little mushy, but at 65 PSI the tires are like a rock. I haven't had them long enough to experiment with different pressures, but I also don't know what they should feel like, as I've never owned a vehicle with LT tires before.
JB.
New member
Check the door sticker. Adjust up as you wish (within reason). If you like 38, it's all good.
Grizzld
New member
Lots of good info in this thread, so I figured I'd post my question here rather than starting a new one:
What's the appropriate tire pressure for the 275/55/20 Nitto Terra Grapplers on a 2012 LE? I'm assuming the Terra Grapplers are LTs -- Nitto's website designates them Extra Load (XL), and the max PSI is 50.
According to the info below, I should put them at around 44 PSI, BUT they're not the same size as the stock tires.
Discount Tires filled them to 38, but I was planning on bumping them up to 40-42.
I know lots of people on this forum have these same tires, so what are you running?
What's the appropriate tire pressure for the 275/55/20 Nitto Terra Grapplers on a 2012 LE? I'm assuming the Terra Grapplers are LTs -- Nitto's website designates them Extra Load (XL), and the max PSI is 50.
According to the info below, I should put them at around 44 PSI, BUT they're not the same size as the stock tires.
Discount Tires filled them to 38, but I was planning on bumping them up to 40-42.
I know lots of people on this forum have these same tires, so what are you running?
JB.
New member
Extra Load (XL) is a reinforced P-metric tire so it follows the same load table except extra pressure can be added to increase load capacity beyond a Standard Load (SL) tire. That contrasts with LT where extra pressure is needed just to bring it up to P-metric load capacity.
I didn't find the exact size in any load tables, but to compare apples to apples, the load index for the Standard Load P275/55/20 is 111, compared to 107 for the stock P245/60/20 and 113 for P265/70/17.
The three tires are actually closer to each other in overall capability than the load index spreads would suggest, but the bottom line is that door sticker pressure should be plenty for the new tire unless you have a preference for adding more.
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JB brings up good info. If you are not happy at 38 (which should be just fine for those tires) and your MAX COLD PSI rating is at 50, you can go higher then the door sticker, (since these are aftermarket tires, not the OEM's) but I would not go higher then say 45. (Safety factor for heat expansion) which may not be a real issue, just my opinion. Then test for yourself which is better for your needs.
Here is an example. I run D load rated LT tires. 8 ply. I know, a bit overkill, but they were on sale! My max cold PSI is 65 psi. However, without a heavy load on the truck, if I fill to 50 or above, very stiff and hard ride. Below 40, steering gets mushy and Mpg falls. Optimum PSI for me, 43-45 PSI.
JB or others can confirm or correct me, but I think your PSI issues depend more on tire construction vs. size. How many ply's and materials used vs. just the size.
Good luck and be safe.
Tire Pressure
Tire Pressure is "Pounds Per Square Inch". It should not matter the size of the tire. The pressure inside of them would be equal. If the manufacturer's recommendation is 32 then that is what you should use when driving under normal conditions on surfaced roads. For you guys increasing it 6 to 10 pounds, first you may be exceeding the max pressure indicated on the sidewall, and in the summer time when the heat and friction kick this up another 5 or 6 PSI, you are really exceeding the capabilities of the tire. Since when have you all decided that the manufacturer of the tire is incorrect and that what you think is better. Safety, tire wear, mpg, are all considered in this. You go outside these parameters and you are creating a possible problem.
Tire Pressure is "Pounds Per Square Inch". It should not matter the size of the tire. The pressure inside of them would be equal. If the manufacturer's recommendation is 32 then that is what you should use when driving under normal conditions on surfaced roads. For you guys increasing it 6 to 10 pounds, first you may be exceeding the max pressure indicated on the sidewall, and in the summer time when the heat and friction kick this up another 5 or 6 PSI, you are really exceeding the capabilities of the tire. Since when have you all decided that the manufacturer of the tire is incorrect and that what you think is better. Safety, tire wear, mpg, are all considered in this. You go outside these parameters and you are creating a possible problem.
Grizzld
New member
The maximum PSI -- as indicated on my tire -- is 50 PSI. At 42, I still have an 8 PSI safety net.
Just so you do not confuse Barry anymore, you did not "overinflate", that would be + 50 psi. You simply increased your psi within manufacturer's specifications. LOL:banana:
Grizzld
New member
Ha, yes, I should've chosen a better word. I meant I put a little more air in the tires last night than I intended so I could let them sit overnight and get an accurate reading this morning.
Once I had a cold psi measurement, I decreased them to 42.
