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Old 04-08-2016, 12:00 AM
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Tire Diameter vs Weight? 35's vs 37's

How would a 35" tire that weighs 80 lbs perform compared to a 37" tire that weighs 71 lbs? I'm not talking about the extra height or break over angle I'm talking about acceleration, braking, gearing etc....

A lot of 35" tires out there weigh almost 80 lbs while a 37" KO2 only weighs 71 lbs.

I currently have 35" KO2's and am thinking about stepping up to 37" KO2's and my guess is they will perform just as well if not better than a heavier 35".

So Weight vs Diameter?

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Old 04-26-2016, 07:13 AM   #2
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Quote:
Originally Posted by jasnusc View Post
How would a 35" tire that weighs 80 lbs perform compared to a 37" tire that weighs 71 lbs? I'm not talking about the extra height or break over angle I'm talking about acceleration, braking, gearing etc....

A lot of 35" tires out there weigh almost 80 lbs while a 37" KO2 only weighs 71 lbs.

I currently have 35" KO2's and am thinking about stepping up to 37" KO2's and my guess is they will perform just as well if not better than a heavier 35".

So Weight vs Diameter?
How do you like your ko2

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Old 04-26-2016, 08:32 AM   #3
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You will essentially numerically lower your gearing so you will loose some acceleration. I want 37 ko2 too. Small 37's but bigger than any 35's.
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Old 04-26-2016, 09:23 PM   #4
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I'd run those 37s. I think they are about 35.4" or so but the 35" KO2s are what- about 33.5"? I think they will feel about the same as a heavier 35 like a Toyo or Nitto. I just ran the Nitto 315s for a week or two- did not like them because they had a radial pull. Yeah, they were slightly shorter but 8-9 lbs (each) heavier than my MTRs and it could be felt so your 37 KO2s will be about like that.
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Old 04-26-2016, 10:40 PM   #5
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Quote:
Originally Posted by jasnusc View Post
How would a 35" tire that weighs 80 lbs perform compared to a 37" tire that weighs 71 lbs? I'm not talking about the extra height or break over angle I'm talking about acceleration, braking, gearing etc....

A lot of 35" tires out there weigh almost 80 lbs while a 37" KO2 only weighs 71 lbs.

I currently have 35" KO2's and am thinking about stepping up to 37" KO2's and my guess is they will perform just as well if not better than a heavier 35".

So Weight vs Diameter?
You should be fine as 4.56 gears and 37" combo is just about perfect for a well rounded performer. You should see your FRWY RPMs drop a bit as you will be running closer to a true 35" tire with the 37s, not a tall 33 as with the 35s you currently have.

Breaking will suffer just a bit not so much from tire weight but from the larger rotational diameter and the increased forces caused by it.

You might also want to consider if you have not done so already adding sleeves and gussets to your front axles. It becomes more important with 37s than with 35s. You seem to like to wheel your Jeep on the harder side so it would be cheap insurance.
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Old 04-28-2016, 01:47 PM   #6
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For the sake of comparison, my 285x75x18 AT2s weight 65# and spec at 34.8". On the ground, they're 34" at 30 psi. The 37" KO2s weigh 72# and spec at 36.5", though we know they're closer to 35+, though I don't know where they'd spec on the ground. 80# is a pretty heavy tire.
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Old 04-29-2016, 07:06 AM   #7
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I swapped to the KO2 37's because of the weight - they were lighter than my Cepek Mud's and drive a lot smoother. I know they are on the smaller side for a 37, but I always liked the look of the KO's and have always had the best mileage from them. I agree with the gusset and sleeve suggestion, and also added 5.13's.

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