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Old 09-22-2012, 01:05 PM   #1
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Wheel and Tire size question

I have a '12 Sahara with the 18's and I want to get new wheels to replace the stockers. I want to go to 33'' tires and am thinking of staying with the same size wheel (18) when I get the new wheels. The wheels are also offered in 17's. So my question is this:

1. If I stay with the 18's and get the 33'' tires is it going to throw off my speedo?

2. If I go with the 17's will the 33's balance out the inch difference since I'm using a larger tire? Meaning I dropped down a size in rim but up a size it tire.

I appreciate any feed back, Thanks.

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Old 09-22-2012, 01:53 PM   #2
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I also wanted to add that I've been researching the hell out of this and already posted similar questions on it. I probably already know my answer but just am nervous at dropping a lot of coin and it not working.

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Old 09-22-2012, 05:51 PM   #3
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Any time you change tire size it's gonna affect the speedometer (and, by extension, the odometer).

But, it's really no big deal. Just get an AEV Procal ($150) and you're good to go. It'll also allow you to adjust your TPMS sensitivity (or turn the warnings off altogether, if that's what you want), set daytime running lights, etc.

Handy little gizmo.

ProCal Module - Electronics - Shop By Category
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Old 09-22-2012, 07:47 PM   #4
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I don't understand the question, but yes, a 33" tire is a 33" tire regardless of wheel size. The only dimension that changes is how tall the sidewall of the tire is and that affects ride quality. Since you're changing tires and wheels, might as well go smaller with the wheels to save some ride quality while you're at it.
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