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Old 08-28-2012, 06:42 PM   #1
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225/75/16 to 33x12.5R15 Duratracs questions...

Hey all -

I am considering upgrading my stock set up 225/75/16 Goodyear Wranglers to the 33" Duratracs with 15" aluminum wheel setup that ESP had in his famous 41 page thread that is still going as we speak. I run the 3.73 gears. I had a few questions:

1.) The famous question: How many MPGS will I lose? I am confused as to the loss of MPG. I have seen it vary by a lot, but some are still getting 20MPG on the highway with this set up but it looks like most of these people are going from the 255/75/17 set up (31" tires) to the 33" set up as opposed to the 28" set up like myself. I am currently getting 18MPG with 70% City, 30% highway. Daggo66 said in one thread to expect to lose 2-5MPG but I've seen 1-2 other posters get 20MPG, with about 16MPG mixed. That doesn't appear to be consistent so I am thoroughly confused.

2.) Will I need to recalibrate my speedometer and is it more cost efficient to do so at the dealership?

3.) What is the minimum body lift/spacers I need to get to run these tires? 1"? I am trying to avoid getting these because they appear to cost a lot of money in terms of inital installation costs plus the marginal loss of MPG from being higher up in the air.

4.) Will I void my warranty from doing so?

Thanks for any responses! I am not a genius on Jeeps but I've done my fair share of reading the other threads on this.

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Old 08-28-2012, 06:51 PM   #2
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This is what I did, went from 225/75/16s to 285/70/17s. Did not notice any significant change in mileage. http://www.wranglerforum.com/f33/mil...ld-162549.html

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Old 08-28-2012, 07:19 PM   #3
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Originally Posted by MacCTD View Post
This is what I did, went from 225/75/16s to 285/70/17s. Did not notice any significant change in mileage. http://www.wranglerforum.com/f33/mil...ld-162549.html

Ah gotcha!! Thanks! I'll look into those instead of Duratracs.
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Old 08-28-2012, 07:47 PM   #4
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Anyone else have opinions?
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Old 08-28-2012, 08:44 PM   #5
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Quote:
Originally Posted by AU95 View Post
Hey all -

I am considering upgrading my stock set up 225/75/16 Goodyear Wranglers to the 33" Duratracs with 15" aluminum wheel setup that ESP had in his famous 41 page thread that is still going as we speak. I run the 3.73 gears. I had a few questions:

1.) The famous question: How many MPGS will I lose? Driving style and how hard you use the skinny pedal will have the biggest impact. I averaged 17.5-19.0 with the combo around town driving conservatively, coasting a lot, timing stop lights, and staying in gear whenever possible.

2.) Will I need to recalibrate my speedometer and is it more cost efficient to do so at the dealership? Dealerships can flash your computer to read 32.1" tires. They cannot and will not adjust your computer for any tire size outside of the stock offerings. Call around and see which dealership will do this for free. If they won't then find out what they charge. If it's considerably less than $149, don't bother with a procal right now. If not, buy the procal. With your computer set to 32.1" while running the 33x12.5R15 your speedometer will be between 0.5-1.0mph off. It may be dead on as it has been experienced by my self and many who are currently running the combo. For the record, my 2010 is set to 32.1" and I'm running BFG 33x12.5R15s. My speedometer is correct calculated against GPS. If you do not re-calibrate your speedo to at least 32.1" or buy a procal "best option" your speedo will be off by 6-7mph moving from 225/75/16 or 29.5" tires to the combo.

3.) What is the minimum body lift/spacers I need to get to run these tires? 1"? I am trying to avoid getting these because they appear to cost a lot of money in terms of inital installation costs plus the marginal loss of MPG from being higher up in the air. The loss of MPG from lifting is nill compared to tire/wheel weight, mods, gears, and driving style. Do not fear this, lift your jeep whenever you can afford to do so and install the lift your self. You can do this in your drive way with no prior mechanical knowledge, two 1-3 ton floor jacks, stands, and basic hand tools. You do not need to lift your jeep to run the combo. You will rub while offroading and you may rub while going over large speed bumps without a lift. Minimum lift to run this combo correctly would be a leveling kit. Proper height to do this for both daily driving and offroading will be a 2.5" kit.

4.) Will I void my warranty from doing so? No.

Thanks for any responses! I am not a genius on Jeeps but I've done my fair share of reading the other threads on this.
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