PSI for 33's
#1
JK Enthusiast
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PSI for 33's
I'm hopefully putting a set of 33x12.50-15 KM2's on my jeep this weekend as long as the rest of my wheels come in today. What pressure do you guys recommend running them at? Does 32psi sound like a good start?
#2
I think alot of shops do 35 and that's what I ride on and it's fine BUT alot of guys here also are down around 33 psi so I think that's what I'm going to try myself.... Should be a little softer ride and hopefully no fuel mileage loss.... I'm on 35" Mickey Thompson MTZ's 12.5x17
#3
JK Newbie
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I run my km's at 30 psi....they are 285's/75/r16(33's) they are closer to 32 on the jeep though...especially at 30 psi...I like the ride...I think at 35 psi or higher the ride might start getting rough.
#4
JK Enthusiast
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Chalk test!! Do it yourself cause every tire/rim/seatofthepants combo could be different from the next guy's. It's a balancing act between ride comfort and tire wear. Also pay attention to the load range of the tires you are looking at. Higher the letter, the stiffer the ride.
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JK Super Freak
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Originally Posted by thelouv
Chalk test!! Do it yourself cause every tire/rim/seatofthepants combo could be different from the next guy's. It's a balancing act between ride comfort and tire wear. Also pay attention to the load range of the tires you are looking at. Higher the letter, the stiffer the ride.
I have 32in on 17in rims and got my JKU with 32psi from dealer. I tested 35psi (as in the door plate) and am enjoying much more. Test yours and see which you (and your Jeep) like most. ;-)
#6
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I just reduced the pressure in my yokohama 305x70xr16's from 40 to 35psi, I have a lesser feeling of the threads now at low speeds. I was amazed to at very low speed you easily can feel the rough thread pattern.
#7
JK Junkie
It all depends on the tire and rim setup. A load range D tire will not leave as nice a footprint as a load range C tire. A 8" wide rim will not leave a wide footprint with a 12.50 tire like a 10" wide rim.
Most results seem to be around 30 psi. I would say set it at 30-31psi and then chalk test from there.
Most results seem to be around 30 psi. I would say set it at 30-31psi and then chalk test from there.