KM2s better than KO2s for Rocky Road? - Jeep Wrangler Forum
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Old 11-07-2017, 10:48 PM
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KM2s better than KO2s for Rocky Road?

So I switched my 32” KM2 that came with the Rubicon for KO2s in 315/70R17.

Today I did 60 miles on rocky dirt road and I’m pretty disappointed in the performance of the KO2s. My brain is rattled to pieces. When I aired the KM2s down to 20 it was smooth sailing. The KO2s even down at 16 were not very smooth.
Anybody else have the same experience?

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Old 11-08-2017, 12:40 AM   #2
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Are they the same load range tire?

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Old 11-08-2017, 03:50 AM   #3
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That new tire you got comes in C or E load rating. If you got the E, that's a much stronger tire than C (the stock rating), but it will result in a rougher ride.


In addition to the possibly higher load rating that Shark_13 suggested, that's also a much larger tire, so more unsprung weight, so rougher ride.
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Old 11-08-2017, 06:01 AM
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My new tire is C loaded, so that shouldn’t be it.
I’m surprised to hear that the bigger tire should give me a rougher ride. I would’ve thought it would handle imperfections in the road better.
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Old 11-08-2017, 10:20 AM   #5
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Originally Posted by AZDane View Post
My new tire is C loaded, so that shouldn’t be it.
I’m surprised to hear that the bigger tire should give me a rougher ride. I would’ve thought it would handle imperfections in the road better.
I'm just speculating. I don't really know anything.
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Old 11-08-2017, 11:22 AM   #6
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Did you lift it?


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Old 11-08-2017, 12:13 PM
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Yes, but I drove it lifted for 4000 miles with the KMs before switching tires.
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Old 11-08-2017, 10:05 PM   #8
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Just speculating again, but maybe narrower tires have more flex as you're going down the road hitting rocks? And maybe the effect of airing down is more apparent with narrower tires.

Also, the KM2s have thicker tread than the KO2s (at least when new). Maybe that has something to do with it? (But I doubt it.)
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Old 11-09-2017, 08:37 AM   #9
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The KO2's are available in both C and E load range. Look on your tire (s) to make sure what you have. Look at all of them in case they mixed load range by accident.

If you have the load range E on any of them, then there is a large part of the difference. While you may have put several thousand miles on the Jeep with the lift kit, were they all with the original tires? Sometimes changing suspension will feel ok on smooth surfaces, then when you get in rough stuff you realize how much stiffer/non compliant it is. Could be your suspension is simply stiffer, and/or your shocks are not able to control the heavier 315/70 tires.
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Old 11-09-2017, 09:03 AM   #10
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It’s the size upgrade, although it seems the stock KM2s have squishy sidewalls when aired down. I noticed the same when I switched to KO2 Es, on very rough or wash boarded areas I run 10-12 and it smooths out. Still not a smooth as the stock KM2s at 15.
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Old 11-09-2017, 09:20 PM
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Like I mentioned earlier they are C loaded. When aired down to 16 they “ballon” quite a bit, so I wasn’t that comfortable taking them further down, but maybe that’s the trick.
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Old 11-30-2017, 11:15 AM   #12
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A dedicated off road tire like the KM2 will always perform better off road than an all terrain, even a top of the line all terrain like the KO2. Which is why I'm disappointed that the new JL Rubicon comes stock with all terrains instead of off road tires like before.

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