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Old 10-01-2015, 03:49 PM
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BFG KO2 vs KM2 Advice Needed

I have a 15 Unlimited Rubicon with the stock KM's 255/75/17's and want to go up a size.

My options are:
KO2's 34x10.5x17 which will increase the diameter from 32.1 to 33.5 and will increase the weight from 46.7 to 55.1 lbs
or
KM2's 285-75-17 which will increase the diameter even more from 32.1 to 33.9 but it will also increase the weight more from 46.7 to 62.3 lbs

I of course would love the extra 0.4 in height with the KM2's but I'm not excited about the extra 7lbs over the KO2. It spends 75% of its like driving around local mountains, moderate and difficult trails, so the KM2's are probably better for that?

Help!....

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Old 10-01-2015, 04:37 PM   #2
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go out and lay a level on the top of your stock tire and measure from the ground to the bottom of the level. now subtract that difference from 32.25" and that is the actual difference you will have with the 34" KO2's. The KM2 are slightly taller and fatter. Many of the guys I wheel with have KM2's and I have 34's KO2's. The KM2's look more aggressive but from my experience are not really any better in the rocks and worse in the snow. Might be better in the mud tho. Hard to beat the KO2's on the highway.

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Old 10-01-2015, 07:30 PM
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go out and lay a level on the top of your stock tire and measure from the ground to the bottom of the level. now subtract that difference from 32.25" and that is the actual difference you will have with the 34" KO2's. The KM2 are slightly taller and fatter. Many of the guys I wheel with have KM2's and I have 34's KO2's. The KM2's look more aggressive but from my experience are not really any better in the rocks and worse in the snow. Might be better in the mud tho. Hard to beat the KO2's on the highway.
Yeah check that out a couple weeks ago they were 31.4 inches tall with 37 psi.
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Old 10-03-2015, 01:09 PM   #4
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Question

KM2's 285-75-17 available again? I thought BFG stopped manufacturing them.
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Old 10-04-2015, 12:34 AM   #5
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I of course would love the extra 0.4 in height with the KM2's but I'm not excited about the extra 7lbs over the KO2. It spends 75% of its like driving around local mountains, moderate and difficult trails, so the KM2's are probably better for that?

Help!....
You will appreciate the extra 7#/tire when you hit those moderate to difficult trails and need a tire that shrugs off possible sidewall damage.
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Old 10-05-2015, 05:43 PM   #6
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Originally Posted by jasnusc View Post
I have a 15 Unlimited Rubicon with the stock KM's 255/75/17's and want to go up a size.

My options are:
KO2's 34x10.5x17 which will increase the diameter from 32.1 to 33.5 and will increase the weight from 46.7 to 55.1 lbs
or
KM2's 285-75-17 which will increase the diameter even more from 32.1 to 33.9 but it will also increase the weight more from 46.7 to 62.3 lbs

I of course would love the extra 0.4 in height with the KM2's but I'm not excited about the extra 7lbs over the KO2. It spends 75% of its like driving around local mountains, moderate and difficult trails, so the KM2's are probably better for that?

Help!....
I run the KM2 in 305/70/17s on our JK on factory 17s. They are a the same height but a little wider than the 285/75/17s. The numbers you are looking at are the "on paper" "unloaded weight heights" Under vehicle load at a real world street psi of 28Lbs. cold they sit right at 33.3" on our JK and sat at 33.1" on our JKU. The 285/75 and 305/70 are true 33" tires.

We ran them on our JKU for the first 10K miles of their life and they performed well. When we switched over to ATZ P3 315/70/17s on the JKU we moved the KM2s to our JK. Honestly I would direct you toward just going straight to 315s. The weight to power difference "loss" between the 285/75-305/70 vs. 315s is almost un-noticable with the 3.6 engine and 3.73 or 4.10 gears.

*315s under the load of a JKU on average at 28-30 psi run 33.6"-33.8"

*285/75s and 305/70s under the load of a JKU on average at 28-30 psi run 33.1"-33.3"

Photos of our JKU 2.5" (really 3") lift with 305/70/17 "sliver rims", and now with 315/70/17 with "gray Rubicon" rims and our JK with 2.5" lift and wearing the 305/70/17s

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