How significant is 9 lb. extra per tire?

[Trauma PA]

It should have 255/75r17s.. a 32" tire

Yes. Current tires are this size.

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[Zachanadandy]

Look at Lunentucker post above, compare Red v Green setups on dyno. That should answer your question with 12lbs extra on each corner.

12lbs made a whopping 3% difference in hp... you can see that big of a delta in back to back dyno runs from a little bit of heat soak. No, that is not SIGNIFICANT, which is what the OP asked? And that's with a 12lb difference, 25% more than the tires the OP is comparing. Odds are it would make about a 2% difference in hp on the Jeep. The pentastar is usually around 230hp to the wheels on most dynos I've seen, so you are talking 4-5hp? Do you really think you'd even feel that difference?

 

[DailyMoparGuy]

This is the type of question you keep between you and your Jeep during those late night pillow talks.

“Hey buddy, I know I’ve put you through a lot these last couple weekends, but imma need you take on 9lbs more per corner. Last mod, I swear baby - shhhh, it’ll be okay.”

 

[Bjeepz]

On my last Mojave I ran 35 inch Falken AT3W's, I noticed a slight difference over the stock 33's but very quickly forgot there was ever a slight change. On my new Mojave that is configured nearly identically I am running 37 inch Cooper AT XLT's in 37's. I believe the Coopers weigh 1 or 2 pounds less, what I notice is acceleration is reduced and breaking power is reduced. .... anyway just an example of what the diameter has made me feel.

I often equate a heavier tire to be potentially more robust, especially if the load range is different as that indicates a potentially stronger sidewall.

As others have said, get the tires you want! You will forever be wondering if you made the right choice if you don't.

 

[Bjeepz]

This is the type of question you keep between you and your Jeep during those late night pillow talks.

“Hey buddy, I know I’ve put you through a lot these last couple weekends, but imma need you take on 9lbs more per corner. Last mod, I swear baby - shhhh, it’ll be okay.”

Basically your Jeep is like F ya! New bad ass shoes!!

 

[molevich]

12lbs made a whopping 3% difference in hp... you can see that big of a delta in back to back dyno runs from a little bit of heat soak. No, that is not SIGNIFICANT, which is what the OP asked? And that's with a 12lb difference, 25% more than the tires the OP is comparing. Odds are it would make about a 2% difference in hp on the Jeep. The pentastar is usually around 230hp to the wheels on most dynos I've seen, so you are talking 4-5hp? Do you really think you'd even feel that difference?

Who pissed in your cheerios this morning? IS there are difference? Yes there is! Anything else semantics. Will he notice a difference between exact same size tire that weighs 59lbs versus 68lbs, answer is yes. I noticed the difference in turning, acceleration and breaking by adding spacers.

 

[Zachanadandy]

Who pissed in your cheerios this morning? IS there are difference? Yes there is! Anything else semantics. Will he notice a difference between exact same size tire that weighs 59lbs versus 68lbs, answer is yes. I noticed the difference in turning, acceleration and breaking by adding spacers.

In my experience given like sized tires I don't notice a 5-10lb difference in driving dynamics at all. That 5hp difference wouldn't make a measurable change in 0-60 or 1/4 mile times that would man's up for your difference in reaction times. Physics says yes you might notice a difference in turning from adding spacers, but acceleration and braking? Placebo effect at best. Spacers won't change that at all. At least with the tire weight there's an actual 2% change that could be felt by the most discerning of drivers, but spacers? No chance they have any effect on acceleration or braking.

 

[Josh00333]

I would and did run AT3’3, they are great tires and I would not run an RT over them especially that much heavier.

My dilemma is I’m putting 35s on my new JT. I’m supposed to go in today to have Toyo Open Country AT3s installed in size 35/12.5r17 (59 lb). I worry that I may regret not getting the Toyo Open Country RT Trails in same size which are 68 lb. I really like the sidewall and tread design of the RT Trails but I’m trying to keep the weight of the tire down hence the decision to go with the AT3. I’m pairing the tire with a 29 lb. wheel.
Thoughts/advice?

 

[ZeeJay]

Yes. Current tires are this size.

Then yes the heavier of the two choices will have an impact, not much of an impact and you will feel it……the catch is you’ll never know you are feeling it, ever. The increase in width and diameter of a 35 you will feel. Get the shoes you want, moot issue when jumping 3 inches of tire size.

 

[Zachanadandy]

I would and did run AT3’3, they are great tires and I would not run an RT over them especially that much heavier.

The ATs are mediocre in loose terrain, mud, or deep snow in my experience. I don't mind the noise so I have always run full MTs for maximum off road performance in our Jeeps. The RTs cave out to bridge the gap on road and off between an AT and an MT. I've never run an RT, but it's obvious just liking at them they'd be better in loose terrain than any AT. Personally if I had to choose between RTs and ATs I'd always go RT. Have you run an RT to establish such a staunch opinion?

 

[jwilson2899]

So a lot of people are going to dismiss it as not important, but any increase in unsprung weight will definitely have an effect on your truck. I recent went from 71 pound 35's to 65 pound 37's. Upon putting on the lighter tires, my fuel mileage increased 1-2 MPG and the truck felt similar to how it did on the 35's other than initial takeoff. I'm definitely paying a lot more attention to wheel and tire weights moving forward.

 

[ALT2870]

Not sure why you would want to go to the RT outside of looks, the ATIII is a fantastic tire for pretty much everything. Once the Wildpeaks need replaced on mine I'm switching. Looks are cool and all but would prefer a better tire first.

 

[Rocksalt]

2020 Sport S . went from OEM tires to 285 70 17 on OEM rims. . marginal difference. Upgraded to Black Rhino wheels at 10lbs more per wheel. Marginal difference.

 

[Blade1668]

A oddity I had (OEM)245 AT r17 to (OEM) 245 HT r17 loss of few MPG's. Then my jump to 33/10.5 r17 all stock rims the MPG's was similar to the HT loss from AT's. With it being a dog towing now 13.6-15 MPG's my 05 LJ gets the same MPG's towing or better.
It can be and likely noticed, definitely more wear and tear on vehicle overall. "I chose the 10.5 wide to save some of the MPG's" and pounds over 12.5 width.

 

[Trauma PA]

I ended up going with the AT3s. I had them ordered in and it would have been another 3-4 days to wait on the RT Trails to come in. My initial intent was to try to come up with the lightest wheel/tire combination that was not only able to meet my functional needs but also was aesthetically appealing to me. My hopes were that if I could keep the unsprung weight down, I could possibly get away without having to immediately re gear. With the “C” load AT3 in 35/12.5/17 coming in at 59 lb. the only other 35” tire out there that was lighter was the Goodyear Territory MT which sources list as weighing either 52 lb. or 55 lb. If I didn’t have a Bronco with these tires already I may have considered going with them. They have performed well on our Bronco thus far but I wanted more of an AT tire or a hybrid tire thus the choice of the AT3. Then at the last minute in my usual over analysis mode, I brought the 9 lb. heavier RT Trail into the mix based more on aesthetics than on my initial intent of keeping the weight down.

My initial impression of my chosen combination of AT3 and Fifteen52 Traverse HD is that I am pleased so far with the aesthetics as well as the highway performance despite running stock 3.73 gears. I still need to adjust for tire size with my Tazer which will definitely help the shift points. It’s possible, like many have responded here, I would have had the same performance had I gone with the RT Trail but at the end of the day, I wasn’t willing to take that chance for aesthetics alone. My plan is when these tires wear out, I’ll be ready to re gear and jump up to 37s.

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