ShadowsPapa
Well-Known Member
- First Name
- Bill
- Joined
- Oct 12, 2019
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- Runnells, Iowa
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- '25 JTMX, '23 JLU 4xe, '82 SX4, '73 Javelin
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- Retired auto mechanic, frmr gov't ntwrk security admin
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People too often make choices on appearance and not logic or engineering information. Peers tell them it's fine and looks GREAT! People want to impress and love to get likes.There’s a lot of good info in these comments. Now I’m over here wondering if I want to go with bigger tires, if maybe that’s not a great idea. Reading through the article about the jeep engineer who talks about the challenges of reaching best in class towing on the gladiator. Part of the way they reached max towing was by being very deliberate on the tire size they chose. Anyone have insight on this topic?
It's true, and has been laid out by pros, people who really know, that such changes change the towing ability no matter what people wish to think.
Tire size matters. More weight and/or more rolling resistance means more HP needed to get it rolling and keep it rolling. More HP means more heat.......
There's proof in the tire bit by simply swapping tires and watching MPG drop.
Swapping to A/T tires that are the exact same diameter as the stock H/T tires my Overland came with but about an inch wider dropped me a couple mpg. That plainly says it's taking more effort to make my truck go and keep it going. That means I'm burning more fuel for the same distance traveled and burning fuel means producing more BTUs - some of the heat is used in propulsion, some is sent out the cooling system.
(the radiator in my 73 had to be larger and I have to use a shroud due to the increase in HP in the engine to make it get up to speed faster - it generates more heat now)
Adding the weight to my truck made a difference in mpg as well. I've dropped an easy 3 mpg with my mods, (tires, bumper, winch, etc.) meaning I've got less power to pull and will need to remove more heat from the engine.
There's no simple internet formula that will tell you how much impact there is for every change in tire size or weight, it's basic engineering, physics, etc. You can't take more effort to roll the vehicle down the road and not take away the ability to pull something else down the road.
If you have the ability to pull 7500 pounds and only pull 5500-6500, then it's not going to be a big deal at all.
I'm not implying end of the world stuff or that it matters to all people but if you will be towing near capacity, it may well matter.
My Overland factory tow rating is 6,000 pounds. I only tow a bit over 5,000 so I've got roughly a 1,000 pound leeway. Not a biggy to me. (and I don't see 8th gear very much when towing)
For sure.Axle, Tie Rod Arm and Drag Link Arm are all wider on a Max Tow
they have to be to tie the left and right knuckles together, and to tie the right knuckle to the pitman arm.
The knuckles sit farther out.
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