What PSI for 33" KM2's?
Thread Starter
JK Freak
Joined: Aug 2007
Posts: 618
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From: Manassas, VA
What PSI for 33" KM2's?
I just got my KM2 285/70/17 installed on my AEV Pintlers, and am not sure what PSI i should run them at. I think Costco filled the tires with nitrogen to 30 in the front, 35 in the back, but not sure what most people run them at?
Also, from 0-7mph, it seems like its a little rough (kinda hard to describe the feeling), but once you get past about 7mph, things seem fine. I have never driven a M/T tire before, so I dont know if this is normal or not, but thought I would ask. Could it just be the new tire getting used to being on pavement?
Also, from 0-7mph, it seems like its a little rough (kinda hard to describe the feeling), but once you get past about 7mph, things seem fine. I have never driven a M/T tire before, so I dont know if this is normal or not, but thought I would ask. Could it just be the new tire getting used to being on pavement?
JK Jedi Master
Joined: Nov 2006
Posts: 15,170
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From: .
Don't worry about the roughness from 0-7. The lugs on the KM2s are fairly large and that is what you are feeling. It will smooth out a little after a little wear.
As far as the air pressure you should probably run an equal amount of air in all of the tires.
Try using the chalk test to determine you air pressure.
Get a piece of sidewalk chalk and a tire pressure gauge.
Draw a chalk line across the entire tread of all 4 tires, wide enough to see good. Drive in a straight line for about 100' or so then look at the chalk.
You are shooting to get the chalk to wear evenly across the entire tread pattern. If the chalk is worn on the center you have to much pressure and if it is worn on the sides you don't have enough air. Do this (removing or adding air pressure) until you find the pressure that wears the chalk line evenly. This will give you a good ride, even tire wear, and the best foot print.
As far as the air pressure you should probably run an equal amount of air in all of the tires.
Try using the chalk test to determine you air pressure.
Get a piece of sidewalk chalk and a tire pressure gauge.
Draw a chalk line across the entire tread of all 4 tires, wide enough to see good. Drive in a straight line for about 100' or so then look at the chalk.
You are shooting to get the chalk to wear evenly across the entire tread pattern. If the chalk is worn on the center you have to much pressure and if it is worn on the sides you don't have enough air. Do this (removing or adding air pressure) until you find the pressure that wears the chalk line evenly. This will give you a good ride, even tire wear, and the best foot print.
Thread Starter
JK Freak
Joined: Aug 2007
Posts: 618
Likes: 0
From: Manassas, VA
so i dropped the PSI to 31psi in all 4 tires, but this morning, my TPMS light came on and stayed on the entire ride to work. I was VERY cold this morning, like 35 degrees according to the temp gauge on the jeep. Is there something that i can get done to fix the TPMS sensors?
