Width v height vweight

[wanderer]

Shopping for new tires for the rubicon x
i have a 2.5 mc game changer lift with black shocks

stock bfg weigh in @ 71lbs 35

I am going 37s for sure and really want to avoid regearing this jeep has 456 gears

I am looking at a set of 38 ridge grapplers to be specific these are 37..7” Tall 11.5” wide
And weigh 75 lbs

other tires that i am considering are
Mickey thompson 37x 12.5 and weigh 70 (which seems light)
Still others are in the 77 to 80 lb range

Other questions
Which is most critical in affecting your axle
Weight or diameter?

seems to me rotating mass is more critical than a larger diameter rotating?

Any one running a 38 inch narrower tthan 12.5 tire?

How loud are the ridge grapplers ?

any other suggestions in 37 x 11.5 or 12.5 inch range?

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[GATORB8]

Anything will be an improvement over the KO2s.

I really think it's both and given the same wheels, I'm not sure you'll feel the ~5 pound difference much more than the added diameter.

I've run RGs on my trucks for a while, currently have 37x12.50R18s on the 2500 and they are great on road. Pretty quiet for what they are. I got 60k out of a 35" set on my Ram half ton previously.

With the Jeep, there was a huge power difference from 37" KO2 to 38x13.50 Trail graps, but I also went beadlock so that's like 35 lbs more a corner.

Gut, I think you'll probably have a similar experience between the 38x11.50 and 37x12.50 with the 6 lb difference offsetting the 1" of diameter. I think I'd personally go 37x12.50 with those options.

 

[grimmjeeper]

Other questions
Which is most critical in affecting your axle
Weight or diameter?

seems to me rotating mass is more critical than a larger diameter rotating?

While rotating mass has a small impact, diameter has more than 10x the impact.

Diameter has a direct and dramatic effect on engine RPMs. Bigger tires = lower RPMs. Shorter (higher number) gears restores the RPMs to a more ideal number. The added leverage of a bigger tire has a much more dramatic effect than weight.

When choosing to upgrade gears, you use a simple formula:

Old gear × new tire size ÷ old tire size = new gear

The added weight (along with bigger contact patch and rolling resistance) is why you always round up to the next shorter (higher number) gear.

 

[JEEP4U]

Tire Diameter

 

[jadmt]

agree diameter...I run two sets of tires currently one set of pizza cutters 35x10 on stock wheels that weigh 88lbs and one set of 35x12.5-17 on AEV borahs with rings that weigh 108 lbs. their is no real seat of the pants difference in daily driving ie handling or acceleration and mpg is the same on the same routes..I check every tank by hand and they get within a 10th or two one way or the other..a few days ago my buddy stopped by and I swapped his 37 toyos on mine and while it was not terrible I could feel it had less acceleration at normal driving ie light on the gas...when punching it from a stop or punching at say 60mph to 80mph floored there was not a lot of difference seat of the pants. I was kind of surprised.

 

[Whaler27]

Anything will be an improvement over the KO2s.

The quality/utility of KO2s is a hot topic. People disagree, some intensely, but I have been running that KO tread for over 30 years, on Jeeps and trucks, and my experience has been fantastic. If you look at the composite ratings over thousands of buyers and millions of miles (on Tire Rack and other retailer sites), the KO and KO2 have gotten among the highest ratings in the tire industry. They suck in mud, and they will hydroplane readily if you hit standing water at highway speeds, but they are otherwise great for most conditions, including snow and ice. (Years ago we had a bad ice storm followed by an inch of snow. I tried to get my 4x4 diesel truck up our long driveway. I had Toyo MTs on it at the time. The truck was a heavy diesel, with a heavy tool box in the back. With all four tires spinning, I couldn’t make it past half-way up, even when I got a run at it. In mid-frustration my wife got home. Her grand Cherokee with KO2s went up the driveway easily. Hardly a slip. I immediately went to the tire store and bought some studded Duratracs. After that, I was able to crawl up the driveway with nary a slip too.) I’ve run studded Duratracs for winter truck tires ever since. My newest truck, a diesel F350, came with Duratracs and, like the KO2 on this forum, they get loads of hate from some of the most outspoken members on that forum. Mine are running great, like the last four or five sets.

Tire design, like boat hull design, is a series of compromises. No design can be optimized for everything, and every design will be blamed for operator failures in the environment where they perform worst.

 

[jadmt]

The quality/utility of KO2s is a hot topic. People disagree, some intensely, but I have been running that KO tread for over 30 years, on Jeeps and trucks, and my experience has been fantastic. If you look at the composite ratings over thousands of buyers and millions of miles (on Tire Rack and other retailer sites), the KO and KO2 have gotten among the highest ratings in the tire industry. They suck in mud, and they will hydroplane readily if you hit standing water at highway speeds, but they are otherwise great for most conditions, including snow and ice. (Years ago we had a bad ice storm followed by an inch of snow. I tried to get my 4x4 diesel truck up our long driveway. I had Toyo MTs on it at the time. The truck was a heavy diesel, with a heavy tool box in the back. With all four tires spinning, I couldn’t make it past half-way up, even when I got a run at it. In mid-frustration my wife got home. Her grand Cherokee with KO2s went up the driveway easily. Hardly a slip. I immediately went to the tire store and bought some studded Duratracs. After that, I was able to crawl up the driveway with nary a slip too.) I’ve run studded Duratracs for winter truck tires ever since. My newest truck, a diesel F350, came with Duratracs and, like the KO2 on this forum, they get loads of hate from some of the most outspoken members on that forum. Mine are running great, like the last four or five sets.

Tire design, like boat hull design, is a series of compromises. No design can be optimized for everything, and every design will be blamed for operator failures in the environment where they perform worst.

I have never had an issue with KO2's either and have had several sets and wheeled with many who have them..living in western Montana get all kinds of weather and I actually loved them on snow and ice...i however hated the duratracs on my Power Wagon yet I know others liked them...

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