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Old 01-25-2012, 06:55 PM   #1
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Getting Ready to Buy 35" Tires with new wheels??

We all know the extra attention needed when moveing up in wheel/Tire size. My question which I dont see mentioned alot on Jeeps is wheel/Tire weight..I come from street/strip race cars and weight on the wheels/tires plays a big role in performance..So what I am getting at is if I research and find a 35 wheel/tire combo that weighs the same or slightly more than my current set up why would I need all the extra upgrades? I know the gears are a must but other than that I am not sure? I have seen 33x12.5 wheel tire combos weigh in actually heavier than some 35x12.5 tire wheel combos? The rims I am looking at are 21lbs each my current rims are 24.5 lbs so right off the bat I am saving 3.5lbs per corner. Tires I have researched and have seen weight from 64lbs to 77 lbs that is a huge difference. so if research and can come up with a light weight combo I see no big issues at all as the stress would remain the same? Am I missing something? Always looking to learn. BTW this is a great forum with alot of great guys with vast knowledge. I belong to several Car forums, Vettes, Vipers, Porsches and I see alot af real Douchbags, This is a great forum... Thanks.

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Old 01-25-2012, 07:06 PM   #2
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MT Classic IIs are 17# a pop for 15x8. I couldn't believe how much lighter they were than my stock canyons.

However, the big performance hit when going to bigger tires is the torque needed to rotate the tire due to increase in radius, not the weight.

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Old 01-25-2012, 07:19 PM   #3
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MT Classic IIs are 17# a pop for 15x8. I couldn't believe how much lighter they were than my stock canyons.

However, the big performance hit when going to bigger tires is the torque needed to rotate the tire due to increase in radius, not the weight.

I agree the gear change would need to be a must..But other than that I am not sure anything else would be needed provided it is kept low weight. Thanks.
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Old 01-25-2012, 07:26 PM   #4
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The taller tire will play havoc with stock brakes so be ready to upgrade the brakes at the same time. See Mr. Blain about some new Black Magic brakes and the correct rotors and you should be good to go.

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Old 01-25-2012, 07:29 PM   #5
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Some people care, some don't. there was a four wheeler article about weight and on road performance awhile back. They tested a heavy steel bead lockwheel on the heaviest tire they could find, the general grabber competition tires vs some alloy wheel and a very light good year duratrac. Iirc they saw a definite mileage increase, decreased stopping distance, better acceleration, etc with the light setup, but that the heavy set up was nearly bomb proof and good for primarily off road rigs. I run a set of alloys and duratracs myself
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Old 01-25-2012, 08:51 PM   #6
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It's not just a matter of mass (weight, if you prefer), it's also a matter of the tire diameter and multiplication of force because of the increase in diameter.
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Old 01-25-2012, 09:21 PM   #7
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Quote:
Originally Posted by lindel
It's not just a matter of mass (weight, if you prefer), it's also a matter of the tire diameter and multiplication of force because of the increase in diameter.
That is definitely a huge factor however rotating mass should be considered. My jeep with 33" duratracs and 4.56s will be "peppier" than if I put on a set of 17" steel beadlocks and 33" General Grabber Competition reds or the like. But I agree, gearing is huge.
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Old 01-25-2012, 09:22 PM   #8
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It's not just a matter of mass (weight, if you prefer), it's also a matter of the tire diameter and multiplication of force because of the increase in diameter.
more torque?
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Old 01-25-2012, 09:26 PM   #9
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Larger tires, or tires with more mass will take more torque to start moving, yes. They'll use more fuel and take longer to stop too.

I wasn't discounting rotating mass, just making mention of greater forces due to greater size. That would be the same even if the mass/weight is equal.
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Old 01-25-2012, 09:27 PM   #10
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Quote:
Originally Posted by chop110 View Post
more torque?
ie - better gears = multiplying torque
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Old 01-25-2012, 09:37 PM   #11
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Quote:
Originally Posted by aztj View Post
ie - better gears = multiplying torque

x2!

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