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Old 04-29-2011, 05:24 PM
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Another tire size question

I'm looking into 20's with larger then stock tires. Do you and can you get our cars reprogrammed to compensate for the larger diameter?
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Old 04-29-2011, 05:59 PM
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Re: Another tire size question

Seems like you need an after market programmer.
When I went in to the dealer to get the ESC TSB the dealer said he couldn't do it.

I was just going to wait to do mine until the Superchips came out.
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Old 04-29-2011, 06:25 PM
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Re: Another tire size question

That sucks. The size i'm planning on going is almost 5 mph a 7.29% difference
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Old 05-02-2011, 08:04 AM
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Re: Another tire size question

illudezion,
You certainly can and perhaps at your dealership. My local dealership will re-calibrate for me when I install my lift & 33s.

Remember a tire size increase doesn't change your mph linearly, it is percentage based. Here is a good explanation http://auto.howstuffworks.com/car-dr...eedometer4.htm and here is a good tool http://www.csgnetwork.com/speedocalibcalc.html.

And this works both ways, increase or decrease in overall tire O.D, not necessarily rim.
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Old 05-02-2011, 01:23 PM
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Re: Another tire size question

Thanks. I knew that. I want to go with larger series tires on the 20s so the OD is larger and will be a 7.29% difference. Hopefully my dealership can do it.
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Old 05-02-2011, 01:31 PM
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Re: Another tire size question

What size tires are you going with?

I was under the impression 32" tires were pretty much the biggest you could go on stock suspension. That being said.... those tires are about 5.3% larger. Where are you getting 7.3%?
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Old 05-02-2011, 06:21 PM
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Re: Another tire size question

I was actually thinking of going 22s with 275/50/22. Which would have a OD of 32.82in. I just think that 40 series are too skinny looking for the car.
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Old 05-02-2011, 07:07 PM
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Re: Another tire size question

^^Hate to say it but a 32.8" tire won't fit without a permanent lift. If you want a 22" rim with a 275 section width (10.8") you will need a 275/40r22 (30.6") or 275/45r22 (31.7") tire.

Don't forget that if you get to wide you're going to need spacers, if the rim offset us the same as OEM that is.
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Old 05-02-2011, 10:31 PM
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Re: Another tire size question

Thanks for the input been working on cars for a long time and know all about offset and OD. My original question is can the Jeep be recalibrated.
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