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17" to 18" Tire Upgrade

Switching from 17" to 18" tires

17" to 18" Tire Upgrade

Postby Elvira [OP] » Oct 12 2011, 3:53pm

Folks, wanting to switch from OEM 265/70-17 to OEM 265/65-18 tires/wheel combination. The local GM dealer is telling me the computer has to be re-calibrated or the truck will not shift/run right. Unfortunately, since my truck did not come with 18 inch tires due to the 6.2L engine/tow package, the dealership will not re-calibrate the computer. Sounds like a crock to me, but I do not want to give any excuse not to cover the warranty. Any suggestions? Thanks, Elvira
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Re: 17" to 18" Tire Upgrade

Postby deathphoenix99 » Oct 12 2011, 5:32pm

There's only a 0.1% difference in size between the two tires. It will not change anything and your speedometer will still be correct. They are full of it, unless you went to a larger/smaller diameter tire, then nothing will change. The only difference between the two is the 17's have more sidewall and the 18's have more rim.
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Re: 17" to 18" Tire Upgrade

Postby Elvira [OP] » Oct 12 2011, 6:18pm

Thank you so much! I got 4 new tires and 18" inch wheels for $1200 plus tax and hoped it was not too good to be true. Thankfully, not!
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Re: 17" to 18" Tire Upgrade

Postby deathphoenix99 » Oct 12 2011, 6:30pm

No problem. Post up some pics, and now you'll have to reset the wheel sensors with the truck, but that's an easy task and is outlined in the the manual.
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Re: 17" to 18" Tire Upgrade

Postby Elvira [OP] » Oct 12 2011, 6:38pm

Will do! Thanks again!
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Re: 17" to 18" Tire Upgrade

Postby lowrider » Oct 12 2011, 6:42pm

Your Dealer is really FOS. Makes you wonder about their automotive abilities in other areas. Look the chart I have attached and you'll see that the difference in OD is .2".

http://www.tirerack.com/tires/tires.jsp ... &tab=Specs

I basically did the same thing, only my truck came with 17s and 245/70/17 and I switched to 18s and to keep the OD the same I went with 265/60/18.

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Re: 17" to 18" Tire Upgrade

Postby Elvira [OP] » Oct 12 2011, 6:44pm

Thanks, Lou!!
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Re: 17" to 18" Tire Upgrade

Postby starspangled6.0 » Oct 12 2011, 7:18pm

Good grief, why in the heck would your dealer try and tell you that BS? I second what all the other guys say- you'll be just fine. And, if there is any change in the speedometer, you can either get it reprogrammed at a DIFFERENT dealer, or just buy a programmer yourself (usually $250-$300).
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Re: 17" to 18" Tire Upgrade

Postby lowrider » Oct 12 2011, 7:23pm

starspangled6.0 wrote: And, if there is any change in the speedometer, you can either get it reprogrammed at a DIFFERENT dealer, or just buy a programmer yourself (usually $250-$300).



But, that's the point - THERE WILL BE NO CHANGE!!!!

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Re: 17" to 18" Tire Upgrade

Postby MadHatter » Oct 12 2011, 7:24pm

i went from 265/65/18 to 245/55/22 (both OEM)and called while at the dealer for another unrelated issue asked if i needed to get anything reprogrammed and they told me no.
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