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2007 Tahoe 20" Wheels

24 messages,  Last post on Jul 26, 2009 at 5:24 PM

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#20 of 24 Re: Replacing 17's with 20's [toecutter] by harrybackman Sep 04, 2007 (8:09 pm)
Replying to: toecutter (May 22, 2007 2:17 pm) You guys are killing me, do any of you know the difference between width and diameter?   first number is width in mm, to convert to inches, divide by 25.4.   second number is sidewall ratio (to the width) ie 55 = 55% of the width   third number is wheel diameter.   so to calc tire size for - say a 305/50/20 you would say   305mm / 25.4 = 12" wide x .50 x 2 (two sides to a tire) plus 20 (wheel diameter) = 32" diameter tires   now you can run 15" wheels with 35" tires if you have a high sidewall ratio (lots of rubber vs lots of wheel), see the difference?   my 07 silverado crew cab just got a 2" leveling kit, i tried 305/55/20's and they rubbed when i turned, so i cant go quite that big, either have to go down to 285 wide, or to 50 sidewall.   any questions?
#21 of 24 Re: Replacing 17's with 20's [toecutter] by 73shark Sep 13, 2007 (6:50 pm)
Replying to: toecutter (May 22, 2007 2:17 pm) I believe the recalibrating for 20s will also update the ABS algorithm for the increase in rotating mass. Believe me those 20s are heavy. Just rotated mine and thought I was going to need a forklift.
#22 of 24 Upgrade from an 17" to 20" rim by christalry Feb 08, 2009 (8:00 am)
I am wanting to upgrade from the 17" OEM rim to the 20" OEM polished rim that GM offers. I keep getting different answers as to whether or not the computer reprogramming will take care of any potential problems I may have with the ABS, Speedometer and gas milage indicator. Each dealership I've called has given me a different answer and one basically said that it isn't worth it.   It seems that if I were to get a 20" rim with a lower profile tire that the overall diameter would be the same. I just do not want any issues with ABS or to void any warranties. Any suggestions would be appreciated. Replies to this message: obyone (Jul 26, 2009 5:24 pm)
#23 of 24 by 73shark Feb 08, 2009 (4:44 pm)
If the OD of the 20" tire is within a couple of percent of the OD of the 17" tire, then the error is probably negligible. Not sure the same can be said of the extra mass and the ABS.
#24 of 24 Re: Upgrade from an 17" to 20" rim [christalry] by obyone Jul 26, 2009 (5:24 pm)
Replying to: christalry (Feb 08, 2009 8:00 am) The tire size you need with a 20" rim so that there is zero variance is 275/55R20

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