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Old 01-25-2012, 10:07 PM
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Tire Weight vs. Tire Size?

I have narrowed my tire choices down to two different tires, the Goodyear Duratrac and the Toyo M/T; however, I was wondering which has a larger effect on your drivetrain, the relative size or the weight? For example, take a 33" Toyo at around 70 lbs, and a 35" Duratrac at around 60 lbs (hypothetically), which would have a greater effect on the drivetrain? Sorry for the noob question .

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Old 01-25-2012, 10:19 PM   #2
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The heavier tire, regardless of size, has a greater effect on unsprung weight. That will affect braking, shocks, and to some extent fuel economy.

The larger tire will affect final gear ratio, and that will show as poor MPG and a lack of power.

I recently change from a D rated BFG KM2 to an E rated Nitto Trail Grappler on my Power Wagon. Both are 35/12.5-17 tires, but the Nitto is slightly shorter, an inch wider, and 18 lbs heavier. I needed the higher capacity of the E rated tire, but now pay a 6% penalty in MPG, and I can feel the weight in the brakes.

Whenever the new Orange Crush Rubicon is delivered we're going up from the stock 255/75-17 Rubicon BFG to a 255/80-17 E rated BFG KM2, and I fully expect to lose a similar amount of MPG.

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Old 01-25-2012, 10:28 PM   #3
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I'm not sure which has the biggest affect. I used to run the 82lb 35 inch Toyos and they ate my ball joints in 6k miles on my '10 Rubicon. They also chunked terribly, some of the center lugs were about ready to fall off as they cracked at the base nearly all the way through. They sure looked good though. I'm trying KM2s this time, at 7k miles on my '12 Rubicon they look perfect and are around 15lbs per tire lighter. I have read that the total rotating mass being 60 lbs more with the Toyos is the same as having ten times that much weight (600lbs) in the Jeep.

The Toyos were E rated and I could go down to 8psi off road. The KM2s are D rated and appear completely flat at that psi. I run 16 in them off road.
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Old 01-26-2012, 11:06 AM   #4
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When talking about reducing rolling wheel weight, you have to seriously consider rim material and size. Some cases a large tire small steel rim for example can weight more then say a larger aluminum rim and tire equalling same height, say maybe a 18" wheel with a 315/65r18 kevlar mtr. Just saying.
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Old 01-26-2012, 11:19 AM   #5
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The diameter of the tire plays more of a factor on everything than weight. Leverage is the key word here--the brakes have less leverage over a taller tire, the engine has less leverage over a taller tire, and that taller tire has more leverage on the hub bearings, ball joints, and axle shafts. Weight is obviously something you want to limit as much as possible but in terms of a 60 lb 33 vs. a 60 lb 35, the 33 will not require as much exertion to brake and accelerate.
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Old 01-26-2012, 11:49 AM   #6
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What im saying is if you have two equal overall size tire/rim combos, but one is lighter due to larger and lighter rim and lighter tire compound that tire with the lighter mayerials will turn easier then the heavier one and shead pounds in all four corners
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Old 01-26-2012, 11:54 AM   #7
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Can you use the stock wheels with the 255/80/17 tire?
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Old 01-26-2012, 03:01 PM   #8
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Ive never run that size on OEM rims. I believe there similar to a 33x10.50r17 I could be wrong. If they are similar to a 33 then they will most likely have slight rubbing issues because of your rims backspace.

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