Same diameter but Increasing tire weight

[gearhead22]

Hello all. Currently I’m running 37” c load ko2’s which are listed at 63lbs, I’m looking at a used set of 37” Baja boss at’s that are listed at 80lbs each. So 68lbs total increase in tire weight.

im still on the factory 4.10’s (JTR) and currently happy with how it drives. I’m worried by adding that much weight it’s going to make regearing more of a necessity.

I see 8th gear currently, and have no complaints about the performance. Just worried it’s going to impact it quite a bit.

from my understanding diameter has more effect than weight in terms of needing to regear. But 68 more lbs seems hard to ignore and I find it hard to imagine it won’t effect it to a decent amount.

thoughts?

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[Thunderspud]

This sort of thing is so subjective. One person's idea of "happy with how it drives" and "decent amount" are never gonna match the next.

With that caveat, I have three sets of wheels and tires that end up on this truck depending on the season/occasion....the stock Rubicon wheels with the stock 33" Falken's, another set of stock Rubicon wheels with a set of skinny Baja Boss 35's, and a set of the Mopar steel rims with 37" Firestone MT's.

Can I tell a difference between them? Sure. Is that difference enough for me to care? Nope.

Honestly, I have never even looked at the actual weight differences, nor have I calculated any reliable long-term MPG difference between the sets.

My thoughts? Unless you have specific MPG numbers to meet, or some other objective goal in mind.......drive what makes you happy.

 

[NC_Overland]

You’re already pushing the limits with 37s on 4.10s and BFGs run small so it’s not a true 37. You’re definitely going to notice a difference with increasing diameter and weight.

 

[Thunderspud]

You’re already pushing the limits with 37s on 4.10s

What "limits" are we talking about here?

 

[LouisvEarlleJT]

You are going to need 5.89’s, 3 pedal commanders wired in series, and a hellcat swap. Otherwise it will be completely awful to drive.




I kid. You probably won’t notice a difference.

 

[NC_Overland]

What "limits" are we talking about here?

Decent drivability.

 

[Thunderspud]

Decent drivability.

So........subjective. I enjoy my 37's on steel wheels just fine with 4.10s. You might not, and that's cool.

 

[NC_Overland]

So........subjective. I enjoy my 37's on steel wheels just fine on 4.10s. You might not, and that's cool.

You literally missed the point of my post. Go re-read it. I said that the OP will notice a difference between the increased weight and diameter combined. Which was the question asked.

But if you’re really wanting to be a stickler and say it’s “subjective”. It’s definitely not an ideal
gear ratio. 4.56 would be close to stock. Many prefer 4.88 to compensate for the added weight, etc.

 

[Thunderspud]

Many PREFER 4.88 to compensate for the added weight, etc.

I didn't miss the point......and I am not trying to be a stickler. Just relaying to the OP that the answer to his question is impossible to provide without injecting some of our own biases.

 

[NC_Overland]

I didn't miss the point......and I am not trying to be a stickler. Just relaying to the OP that the answer to his question is impossible to provide without injecting some of our own biases.

Dude. You’re picking and choosing what you respond to. You ignored everything else and quoted the part that I added what could be construed as subjective.

 

[Figmo]

Remember what she said: "Size matters more than weight"

 

[Red Hot Sloth]

A few weeks ago I went from 80lb 37’s which were 36.8” D load to KO2 37’s C load which are sized small, as I measured at 36psi are 35.5”. I noticed a definite improvement in response and mpg. I was stock geared 4.10. You will notice it. The weight is a factor as well as the increased diameter. If you tow anything, drive in steep hills or mountains take it into consideration. I saw 8th gear in the flats and slight inclines(never bothered me but it bothers some). Now Im in 8th on a regular basis even on steeper inclines. I live in SoCal and commute about 100 miles a day. The decreased diameter is a little bit of a bummer as the taller tires work out better when we’re wheeling giving a little more clearance when aired down but the benefit of the lighter tires works out better onroad. I hope this helps.

 

[Sandman 4x4]

Hello all. Currently I’m running 37” c load ko2’s which are listed at 63lbs, I’m looking at a used set of 37” Baja boss at’s that are listed at 80lbs each. So 68lbs total increase in tire weight.

im still on the factory 4.10’s (JTR) and currently happy with how it drives. I’m worried by adding that much weight it’s going to make regearing more of a necessity.

I see 8th gear currently, and have no complaints about the performance. Just worried it’s going to impact it quite a bit.

from my understanding diameter has more effect than weight in terms of needing to regear. But 68 more lbs seems hard to ignore and I find it hard to imagine it won’t effect it to a decent amount.

thoughts?

Also ride quality will suffer, along with every dynamic involved.

 

[ChrisNLA]

There is no way you won't notice 17 extra pounds per corner.

I just switched from 285 Falken AT3W to 285 BFG KO3 and while I can't feel it HP or MPG wise, I can certainly feel how the suspension feels different with just the 8 pound difference those tires have.

 

[Sandman 4x4]

I can’t say it enough. I all of the wheeled vehicle racing world, the #2 enemy is weight, but #1 is unsprung weight. That’s the weight where the rubber meets the road, that’s what makes the shocks work doing half their job. To keep the rubber down and the vehicle under control.

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