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Old 12-20-2015, 02:06 PM
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Tire Size Concerns? Weight vs. Diameter

I have read lots of posts about the issues related to large tires. I guess I am still confused as to what actually leads to the issues. Is it the diameter or the weight that causes the issues of a combination of both?


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Old 12-20-2015, 03:46 PM   #2
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Both lead to different issues. Weight hurts your mpg and can wear out components (ball joints, brakes etc) faster. The diameter and/or the width can rub on different suspension components depending on how you use your jeep. Plus for heavier tires you need an aftermarket tire carrier or run without one like I do. I just toss my spare in the back if I'm going some place far

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Old 12-20-2015, 09:08 PM   #3
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I was really confused on the whole tire thing for about a month. The diameter will screw with the speedometer so you need to recalculate what your actual speed/mileage will be. I recently got some new tires, and was so crazy over dropping weight at the wheels, wanting to add a few mpg and making the jeep feel lighter/more pep. I ended up buying some KO2's, E load which are 53#. Made my jeep ride really nice...yet I kept wondering how much better the lighter C load would do. I had to buy new 17" wheels to get C load tires. Ended up the same diameter as the other ones but a little bit wider.

Compared to the heavier E's, The C's were a softer/spongy feel with a lot more rolling resistance. I noticed immediately, how my foot had to push further on the skinny pedal to get the jeep going. I never seen my gas gauge move so fast. I went back to the 16" E load, and the mpg is markedly better. I don't think weight is a big deal as some seem to say. But the width and rolling resistance seemed to have a lot to do with it for my experiment.

I saw JP mag, do a comparison of the heaviest wheels and tires vs. the lightest 33's. The difference between the sets was over 30 lbs. and all that resulted was a few HP and .5 mpg diff. Was pretty shocked at such a small diff.
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