Tire ?.... Yes I searched. - JKowners.com : Jeep Wrangler JK Forum
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post #1 of 29 Old 04-10-2011, 10:03 PM Thread Starter
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Tire ?.... Yes I searched.

Do the bigger KM2's sizes run true to size or do they also run small. I am talking about the sizes above 37's.

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post #2 of 29 Old 04-10-2011, 11:02 PM
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From what I've read 37" KM2's run more like a true to size 35". I can't speak to bigger than that, but I would assume that they also run smaller.

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post #3 of 29 Old 04-10-2011, 11:17 PM Thread Starter
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Quote:
Originally Posted by nc_fjizzle View Post
From what I've read 37" KM2's run more like a true to size 35". I can't speak to bigger than that, but I would assume that they also run smaller.
Yeah I was assuming the same thing, I am hoping someone who runs them or has run them chimes in.

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post #4 of 29 Old 04-10-2011, 11:31 PM
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Quote:
Originally Posted by Taco08jk View Post
Yeah I was assuming the same thing, I am hoping someone who runs them or has run them chimes in.
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Last edited by nc_fjizzle; 04-11-2011 at 01:05 AM.
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post #5 of 29 Old 04-11-2011, 12:13 AM
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They ALL run a little small. That's every tire out there.

Big Lar runs Krawlers, which are more true to size which is read "over sized".

If you like the KM2 then I would by no means let a few fractions of an inch sway your decision to run them.

I'm in deep tire debate at the moment myself. I have a Jeep on jack stands and no decision on which wheels and tires to go back with.

37" KM2s are on back order for a little longer and 37" MTR/Ks are on back order for at least 2 months according to Goodyear this past Friday.

Let me know if I can help with pricing or anything fun like that.

Marcus


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post #6 of 29 Old 04-11-2011, 12:26 AM
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I know you are asking about larger than 37s but for the record my KM2 37s new were 36'1/2 - great tire

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post #7 of 29 Old 04-11-2011, 03:27 AM
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Quote:
Originally Posted by TEXASKEV View Post
I know you are asking about larger than 37s but for the record my KM2 37s new were 36'1/2 - great tire
Same here when they were new.

This is the new 37 against the old 35. Keep in mined this was minus a wheel, one i squeezed her onto a rim it fattened up and shortened the tire a bit.



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post #8 of 29 Old 05-25-2011, 03:50 PM
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Quote:
Originally Posted by RiverCityOffroad View Post
They ALL run a little small. That's every tire out there.

Big Lar runs Krawlers, which are more true to size which is read "over sized".

If you like the KM2 then I would by no means let a few fractions of an inch sway your decision to run them.

I'm in deep tire debate at the moment myself. I have a Jeep on jack stands and no decision on which wheels and tires to go back with.

37" KM2s are on back order for a little longer and 37" MTR/Ks are on back order for at least 2 months according to Goodyear this past Friday.

Let me know if I can help with pricing or anything fun like that.

Marcus
I just switched to KM2s and am very disappointed in the performance as well as the sizing. Not only are they shorter than MTR Ks they are narrower.
The performance between the two on the rocks is night and day.
If I could get my $1600 back I would.
Until then I am stuck with KM2s.

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post #9 of 29 Old 05-25-2011, 04:59 PM
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My 35" KM2s measured 33.5" new (were the first tires I put on my Jeep). The 37" KM2 is also the smallest 37 I have seen. I like the ride and performance of the KM2, but I would buy one size bigger than what you want. Procomp and general also run pretty small.

MTRs run true to size, I have them on my TJ and they are almost exact. Toyos, Nitos, and Maxis are also pretty close to advertised. Some swampers run bigger than advertised size .

If you want the KM2s, go for it, just realize that most people (not all) experience much smaller tires than what they paid for.
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post #10 of 29 Old 05-25-2011, 05:08 PM
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Go for the 38x1450 km2
It looks pretty true to size

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*gone*09rubi unlimited Rock Krawler 5.5 long arm w/rrd Coilovers 37 Falken wildpeak's Currie 60's
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post #11 of 29 Old 05-25-2011, 06:00 PM
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My new KM2's 37/17's run 36" at 35 lbs inflated pressure not mounted on the Jeep. Measured on the Jeep they run about 35.5. I only have three inches of lift so a bit smaller is okay for me.
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post #12 of 29 Old 05-25-2011, 06:01 PM
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My new mtr k's 35x12.5r15 measured out to 34'', thats with 30 psi, not as "true" as I thought they would be but great tires nonetheless Fwiw

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post #13 of 29 Old 05-26-2011, 06:21 AM
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I love my 37 km2's. I knew they measured out short, so thats why I went 37 instead of 35

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post #14 of 29 Old 05-26-2011, 11:51 AM
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This is not unique to the KM2, just about every tire out there measures less than advertised when mounted and on the vehicle. MT/R with Kevlar are a little bigger than KM2's, but not by that much.

I'd personally buy a MT/R over a KM2, but I'm sure there are plenty that would choose the other way.
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post #15 of 29 Old 05-26-2011, 11:57 AM
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just my 0.2 worth. I owned 35" km2 and now run 37" MT/R. Ran the same trail as always this weekend and i walked up stuff i didnt last time with the KM2. MAybe it was my lower air pressure then normal ( 10psi when i used to run 15) or the size increase made it easier..... but the MT/R did awesome. very pleased with it.

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post #16 of 29 Old 05-26-2011, 12:27 PM
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Quote:
Originally Posted by voodoojk View Post
MAybe it was my lower air pressure then normal ( 10psi when i used to run 15) or the size increase made it easier..... but the MT/R did awesome. very pleased with it.
The MT/R Kevlar sidewalls flex like crazy when aired down and they have a very large contact patch. I run mine at 6 psi and they wrap and grip like crazy.
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post #17 of 29 Old 05-26-2011, 01:11 PM
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My KM2's 40's come in at 39.25 with 32psi.

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post #18 of 29 Old 05-26-2011, 10:57 PM
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What kind of millage can you get out of a set of KM2's on a 4 door JK ?

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post #19 of 29 Old 05-26-2011, 11:02 PM
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Quote:
Originally Posted by Topkicker View Post
What kind of millage can you get out of a set of KM2's on a 4 door JK ?
Not apples to apples, especially compared to a 40, but we have about 25k on a set of 285s aand they still have quite a ways to go!

The bigger the tire the larger the void between tread blocks which can change how fast they wear. I would expect 30k or better out of properly cared for km2s on an unlimited.

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post #20 of 29 Old 05-27-2011, 05:12 AM
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Quote:
Originally Posted by Topkicker View Post
What kind of millage can you get out of a set of KM2's on a 4 door JK ?
I had wear issues with mine, they wore in a very uneven fashion and were unusable before 30k although they had a good 40% or so tread left. Not sure why mine wore like that but they did, I would usually expect 40k+ out of set.

FWIW I got 60k+ out of a set of MT/R's.
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post #21 of 29 Old 05-28-2011, 08:23 AM
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Originally Posted by PhilD View Post
The MT/R Kevlar sidewalls flex like crazy when aired down and they have a very large contact patch. I run mine at 6 psi and they wrap and grip like crazy.


Are the MT/Rs excessivly noisey on pavement?
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post #22 of 29 Old 05-28-2011, 09:00 AM
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Are the MT/Rs excessivly noisey on pavement?
MTRs are really quiet on the pavement, but they do have balancing issues. I love mine!


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post #23 of 29 Old 05-28-2011, 09:19 AM
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MTRs are really quiet on the pavement, but they do have balancing issues. I love mine!


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Yep, I feel the same about mine.

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post #24 of 29 Old 05-28-2011, 09:46 AM
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Originally Posted by RiverCityOffroad View Post
They ALL run a little small. That's every tire out there.
Dp
Marcus
I am not sure this is entirely accurate. On the rim aired to 28 psi my trxus mt spare measure 37". On the jeep, same psi, 36.5".
I am not aware if the bulge/settlement is supposed to be accounted for.
I ordered 17"x8" soft 8's but I can't be sure they aren't 8.5" rims.
If I measure by marking out a rotation line on the pavement, and dividing by pi, will the circumference change with tire pressure?
My bet would be yes, but how much difference would a few psi make?
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post #25 of 29 Old 05-31-2011, 09:09 AM
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Quote:
Originally Posted by JK Timmay View Post
MTRs are really quiet on the pavement, but they do have balancing issues. I love mine!
My 40's were very quiet, my 37's are actually a little louder, but still pretty quiet and way quieter than most MT's. I could never get my 40's balanced well, my 37's with no weights were pretty smooth by comparison, and balanced out just fine.
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