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  #1  
Old August 27th, 2010, 10:40 AM
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Martin Spencer
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255/85/16 km2

What pressure are you guys running in these tires? They are a load range E where as the older style was a range D. I searched and saw several threads about tire pressure, but none on the KM2 specifically. Right now I'm running 55psi front and rear, but it feels rock hard. Don't want to run down the highway under inflated, so wanted to see if anyone had tried anything else.

Thanks
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  #2  
Old August 27th, 2010, 10:54 AM
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Why in Gods name would you run that much pressure? Why does everyone ignore the vehicle manufacturers recs?

Your owners manual says 28 front 35 rear.
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Old August 27th, 2010, 11:11 AM
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The tire manufacturer recommends 80 psi. I have been told by several people that running less than 55 psi on a load range E tire will result in premature wear. I am not sure I believe that.... thats why I asked the question!
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  #4  
Old August 27th, 2010, 11:16 AM
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That sounds just crazy to me.

I ran E-rated TracEdges on the Disco (235/85) at 30psi for years.

I think those blasted things lasted a good 50k miles.
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Old August 27th, 2010, 11:20 AM
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No the tire manufacturer rates the tire at 80PSI MAX inflation. That has nothing to do with what you should be running on your truck. Almost any passneger car or Light Truck tire is rated from 55 to 80 PSI Max inflation pressure, but you show me one vehicle that reccomends that pressure except the rear dual wheels of a loaded down dualie pickup truck.

I'm sure you will enjoy how much better your vehicle rides at the correct pressure, it must buck like a horse now.
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  #6  
Old August 27th, 2010, 11:27 AM
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I've been running 35 psi on four corners for a few weeks now and I feel it's too stiff. 55 psi must feel like you're driving a train.
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  #7  
Old August 27th, 2010, 11:28 AM
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It does feel extremely stiff at 55. I run these tires on my 3500 dodge at 65 and love them. trying to find the right pressure for the 90.
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  #8  
Old August 27th, 2010, 02:44 PM
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Try the chaulk test. Draw a couple chaulk lines across the tread of each tire, then drive around the block and see if the chaulk is wearing off all the way across the tread, or just in the middle. Adjust the the pressure as required. 30 to 35psi should be just right for comfort and wear.

Working at a tire store I was amazed at all the guys that would air up tires to their maximum pressure, the max pressure should only be used when the load warrants it. I run 30 psi on my load range D MTR's and have about 40K on the tires with a lot of life left.

Look at it from this perspective, with a load range E tire aired to the maximum pressure, one tire can just about handle the entire weight of your D90.

I'll never forget the question from a fellow club member, "I aired my tires down to 30, why don't I have the same traction as you?" He started at 60psi. I told him "because I am aired down to 12". This was on a snow run.
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  #9  
Old November 23rd, 2010, 07:46 PM
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i'm 32psi front - 37psi rear.
265/75/R16 BFG AT's
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  #10  
Old November 23rd, 2010, 09:33 PM
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Quote:
Originally Posted by hillstrubl View Post
i'm 32psi front - 37psi rear.
265/75/R16 BFG AT's
why more in the rear axle ?
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  #11  
Old November 23rd, 2010, 09:52 PM
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Quote:
Originally Posted by TexasD-90 View Post
The tire manufacturer recommends 80 psi. I have been told by several people that running less than 55 psi on a load range E tire will result in premature wear. I am not sure I believe that.... thats why I asked the question!
My Km2's say max 80 psi on the side. Where are you getting this is a recomended pressure ?
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  #12  
Old November 23rd, 2010, 10:27 PM
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Quote:
Originally Posted by JFD View Post
why more in the rear axle ?
spite?

no real reason, typically if I was to carry any weight that would make sense, but I haven't in a while. Good point, i'll lower to 32 all around.
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  #13  
Old November 24th, 2010, 07:12 AM
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Quote:
Originally Posted by hillstrubl
spite?

no real reason, typically if I was to carry any weight that would make sense, but I haven't in a while. Good point, i'll lower to 32 all around.
the owner handbook also recommend a higher pressure for the rear axle tires, it does not make a lot of sense to me but there is probably a good reason.
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  #14  
Old November 24th, 2010, 08:03 AM
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Years ago I got a set of 235/85s installed on my 88. Driving home from the tire shop the handling on the highway was horrible, and I thought I had made a horrible mistake buying those tires. I checked the pressure when I got home and found they had inflated the tires to 60psi. I decreased the pressure to 32psi, and handling was great.
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  #15  
Old November 24th, 2010, 08:28 AM
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I would guess it recommends higher pressures in the rear to try and dial out some of handling issues with front heavy car
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  #16  
Old November 24th, 2010, 09:23 AM
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Quote:
Originally Posted by sflash868 View Post
I would guess it recommends higher pressures in the rear to try and dial out some of handling issues with front heavy car
Bingo.
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  #17  
Old November 24th, 2010, 08:10 PM
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I have been running 32 psi on all four for years. usally air down to 15 psi
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Old November 24th, 2010, 08:42 PM
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I run , 40 on my 110 on all four corners, ( 255-85R16 KM2 )
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  #19  
Old November 25th, 2010, 08:52 AM
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I have been running between 32-35 for about 3 months now, and getting along great. Thanks for the info guys. BTW I air down to about 12psi and haven't had any trouble there either.
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  #20  
Old November 25th, 2010, 01:34 PM
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Quote:
Originally Posted by Rugbier View Post
I run , 40 on my 110 on all four corners, ( 255-85R16 KM2 )
That's because I told you to. Lol
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