MTR/K's - whos running them? - JKowners.com : Jeep Wrangler JK Forum
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post #1 of 37 Old 12-28-2011, 08:40 PM Thread Starter
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MTR/K's - whos running them?

I have had my MTR/K's for about 9 months now. I have really like the performance of these tires. I have rotated them twice now, understanding that it has more to do with the amount of miles, not time. I just had them rotated yesterday for the second time. I noticed that they had started to feather a little, more so, in the center of the tread. Which made me curious and wonder what is the correct PSI in these tires. I know that can very, depending on what the total GVW is, tire size, ect. So, the question is what size of MTR/K's do you have and what is the PSI on road and off road?

I have 38X14.5X17 - On road I was at 32 PSI, I am trying it at 28 PSI. Off road between 15 - 8 PSI, depending on the trail.

If you have pics of your MTR/K's in action, lets see them.

Last edited by Addiction; 12-28-2011 at 09:05 PM.
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post #2 of 37 Old 12-28-2011, 08:58 PM
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I have the same tires, I run them at 28 psi in the city and 32 on highway if I'm taking a road trip for better gas mileage.

Trails I had gone as low as 8 psi with no beadlocks. Usually 8-10 depending on trail.

My jeep weights about 5300 lbs
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post #3 of 37 Old 12-28-2011, 09:06 PM
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2 door Rubicon.
37x 12.50 17's
About 4000 miles on them.
Approx 32 psi on road.
Approx 8-12 psi off-road.
No wear issues yet.

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post #4 of 37 Old 12-28-2011, 09:16 PM
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I am running 28 now, 30 for about 5k. No issues at 30, but I am going to see how 28 does.

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post #5 of 37 Old 12-28-2011, 10:55 PM
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I'll be watching this thread. May go with this tire next time I need them.

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post #6 of 37 Old 12-28-2011, 11:24 PM
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I'm running 35psi in my 37's. Maybe I will drop to 30psi for a better ride!

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post #7 of 37 Old 12-28-2011, 11:43 PM
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35.12.50.17 9k miles 28lbs road 10lbs trail
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post #8 of 37 Old 12-29-2011, 04:19 AM
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JKU Rubi, 35x12.50's, 9k miles, 34 psi road, 20 dirt.
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post #9 of 37 Old 12-29-2011, 06:05 AM
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4dr JK, 37x12.50-17, about 20k on them. I run 30psi on the street with OEM rubi wheels, and about 10psi when wheeling. I've got some cupping probably due to failing to rotate them properly and possibly due to some worn suspension components. I'll strongly consider getting them again when it comes time to get new tires.


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post #10 of 37 Old 12-29-2011, 06:42 AM
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i've had mine since april 09, i did have issue with front but it was my fault.. i didnt rotate n my alignment was off so they started to cup..

other than that i love my mtr/k's

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post #11 of 37 Old 12-29-2011, 06:47 AM
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I ran 26 psi in my 35x12.5-17's for about 2 years with no issues.


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post #12 of 37 Old 12-29-2011, 06:50 AM
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When I had mine:
32 street
8-10 rocks

Unfortunately when I needed new ones they were on backorder.
I had to go with KM2s
Can't wait to get rid of them to go back to MTR Ks

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post #13 of 37 Old 12-29-2011, 06:58 AM
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I run 37 psi in my 37s on road (I know kinda high) and like 12 psi offroad.

Your best bet would be to do a chalk test to figure out the ideal pressure for your vehicle.
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post #14 of 37 Old 12-29-2011, 07:16 AM
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35 X 12.50 X 17

I've had them for about 4,000 miles. Just rotated and rebalanced for the first time last week.

I run mine on the street at about 30psi and on the rocks at about 10 to 12psi.

I love these things on the trails and rocks, I don't see changing to another tire when these have to go but I may go to the 37's.

I have had a slight wheel balance type shimmy at about 45 mph. It's really not mucy and decreased with the balance and rotation.

all in all, I love my MT/R's

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post #15 of 37 Old 12-29-2011, 07:55 AM
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35/12.50 17's. I ran them at 28 psi. They rode and wore well with the right shocks, especially on all of the gravel roads I travel. They are heavy, more so with steel wheels and at 7000 feet they do put a dent in the Jeep's "performance". While better than the KM2's I still didn't like them in the snow and after one slide into a tree, a really cool, but scary near miss on a slick road and a $4800 accident where the Jeep took out a Subaru, an Isuzu and an F250 without a scratch to itself, I've switch over to Duratracs with alloy wheels for the winter.

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post #16 of 37 Old 12-29-2011, 08:08 AM
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I fall in just about the same as everyone else, but I figured I'd throw it out there anyway - 37s on a heavy 4 door. 31 on the street, 12 on the trails.

I should probably do the chalk test again though, now that I've recently added a lot more weight to the rear.

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post #17 of 37 Old 12-29-2011, 09:56 AM
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35x12.5x17 had them for 40k miles. been running them on the highway at 28psi and on the trail 8-10. have probably 15% tread left.

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post #18 of 37 Old 12-29-2011, 02:44 PM
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I'm running 35s at 35 -37 psi street. I start to get a little wobble at about 28 psi. Mine seem to like higher pressures on the street


EDIT: forgot to mention mine are load range C tires. I went for light weight; figured the Kevlar would do fine on the side walls; that I didn't need the extra weight / side wall plys.

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post #19 of 37 Old 12-29-2011, 09:55 PM
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37x12.5r17's in 8" wide steelies, I run about 31 to 32 psi on the street. Seem to be wearing ok.

I had some feathering issues when I drove on them for a while with a bad alignment, got the rig aligned and all is good now.

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post #20 of 37 Old 12-29-2011, 10:11 PM
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Quote:
Originally Posted by jeeperjkj View Post
I ran 26 psi in my 35x12.5-17's for about 2 years with no issues.
Same psi I ran in them and what I run in my 37/12.50/17 MTR/Ks. Wearing great. 6k miles on mine. Minor cupping on the fronts since I should've rotated them awhile ago. I'm going to stick with 3-4k mile rotations from here on out.


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post #21 of 37 Old 12-30-2011, 05:54 AM
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42x14.50x17

31psi on street and 8psi offroad

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post #22 of 37 Old 12-30-2011, 06:19 AM
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Gents, it all depends on the width of the tire, and width of the wheel.

Same size tire on a wider rim, requires more air pressure to provide a flat contact patch, vs a narrower wheel with the same width tire.

In other words, there are no set air pressures for our aftermarket applications. Test and tune!

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post #23 of 37 Old 12-30-2011, 06:42 AM
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Quote:
Originally Posted by cruzcode View Post
Gents, it all depends on the width of the tire, and width of the wheel.

Same size tire on a wider rim, requires more air pressure to provide a flat contact patch, vs a narrower wheel with the same width tire.

In other words, there are no set air pressures for our aftermarket applications. Test and tune!

RC

Hence!!!

Quote:
Originally Posted by ALASHA View Post
Your best bet would be to do a chalk test to figure out the ideal pressure for your vehicle.
Quote:
Originally Posted by tehiv View Post
should probably do the chalk test again though,
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post #24 of 37 Old 12-30-2011, 06:49 AM
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I am running the MTR/K 35x12.5x16s with Pro Comp alloy 7069s in a 16x9 size at 35lbs on road and about 18 offroad...haven't messed with going down as low as others but don't really need to yet given what we have out here!

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post #25 of 37 Old 12-30-2011, 07:00 AM
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I run mine at 28 psi in the front, 26 psi in the rear (was told by Jeremy at RK that you should have a pressure split front and rear).

I think when the psi is any higher the ride gets a little bit to stiff for my liking.

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