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Another 35s to 37s question

3K views 24 replies 17 participants last post by  Silentfoe 
#1 ·
May seem stupid but im wondering, so here goes. Will 37s that weigh the same as 35s be the same strain on Jeep? There's only maybe a true inch in height difference and ive only read concerns due to tire weight. Any opinions will be appreciated, thank you.
 
#2 ·
No. The 37, being larger, has a higher rotational momentum. This results in more power being required for acceleration, more power being dissipated while braking, more gyroscopic force in corners (affecting ball joints and steering) and because 37’s are often wider you’ll need less backspace, also affecting ball joints (longer “lever”)

Larger tires are often harder to balance so there’s potential for more vibration with all that entails.

Finally if off-roading you’ll have more grip from the larger tires (a plus) resulting into more strain on axles, axle shafts, diff gears etc.
 
#5 ·
It really does make me wonder if 37s are worth it. Seems to me that if you are going to jump through all of the hoops needed to move from 35 to 37 and actually crawl with them you might as well go ahead and set up for 40s.

I am also going to stick with my 35s until it’s time to go full rock buggy. I see many Jeeps running 37s out there these days but I’m guessing that the majority of them have not done the work to take care of the gearing, steering, and braking mods that would render them useful off-road.


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#16 ·
Not sure if I am all correct here because I just went by intuition.

Jeep wrangler torque at engine is 260lb-ft.

On a simple online calculator, increasing the tire 1 inch from 34 to 35 essentially increased the output at the tire tread by 2.5% and close to 2.5% again from 35 to 36.

The way I look at that is 5% weaker output for the vehicle to the ground, and 5% greater wear and strain on the engine, other parts not considered.
 
#19 ·
These are the trails I like to play on. I am still running D44's that have been built up a bit
 

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#21 ·
If you're really going to wheel with 37's, the cost of the tire is only the beginning. 37's keep a lot of 4x4 shops in business.
 
#23 ·
We are, and have been, running 37s on our 2012 Rubicon. We have re-geared to 4.88s. It's also a manual (that matters). Adam's 1350 drive shafts. It has been handling the abuse of relatively difficult crawling for almost a year.

That said, we've fully intended to upgrade soon and that will be happening this next week. RCV front axles, Teraflex ball joints and Synergy C Gussets. We'll also put on the Teraflex front BBK.

Famous last words but I think that'll be it. Honestly, with that done, we might move to 39s.

If/when things break, we'll upgrade. I don't plan on doing D60s and 40s.

Our Instagram page (at Kodathejeep) has some videos of a few things we like to do. We'll be running a 7 rated trail with GenRight on Tuesday and that's a pretty easy trail for us, while still being a fun challenge.

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#24 ·
We are, and have been, running 37s on our 2012 Rubicon. We have re-geared to 4.88s. It's also a manual (that matters). Adam's 1350 drive shafts. It has been handling the abuse of relatively difficult crawling for almost a year.

That said, we've fully intended to upgrade soon and that will be happening this next week. RCV front axles, Teraflex ball joints and Synergy C Gussets. We'll also put on the Teraflex front BBK.


If/when things break, we'll upgrade. I don't plan on doing D60s and 40s.


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I’m running the exact setup, but I’m also sleeved. Been running 37s with no issues, while I’m seeing plenty others break. The D44s will last as long as you beef them up.
 
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