Recalibrating For Bigger Wheels/tires

bhsballer76 · July 3, 2011

Looking to replace th factory 16" wheels on my 04' CC with some Chevy factory 20" wheels. I want to maintain odometer and speedometer accuracy.

Whats the easiest/ best/ most accurate way of doing this?

builderpaul · July 3, 2011

Looking to replace th factory 16" wheels on my 04' CC with some Chevy factory 20" wheels. I want to maintain odometer and speedometer accuracy.

Whats the easiest/ best/ most accurate way of doing this?

Buy new 20" tires with an aspect ratio to match the old 16s

Check sizes here

Knowklew · July 3, 2011

What is your current wheel/tire size?

bhsballer76 · July 11, 2011

What is your current wheel/tire size?

current size is 255/70/16

mattpopovich · July 11, 2011

You could try 255/50/20 or go wider with 285/45/20 and the overall diameter would be very similar and would not require recalibration. I don't recall how much variation you can have before it needs recalibrated, but either one of these would be good for sure. Other sizes may work also.

greentourismo · July 12, 2011

Can/will gm recalibrate for a tire size change?

You could try 255/50/20 or go wider with 285/45/20 and the overall diameter would be very similar and would not require recalibration. I don't recall how much variation you can have before it needs recalibrated, but either one of these would be good for sure. Other sizes may work also.

jimbrown1 · July 12, 2011

Can/will gm recalibrate for a tire size change?
You could try 255/50/20 or go wider with 285/45/20 and the overall diameter would be very similar and would not require recalibration. I don't recall how much variation you can have before it needs recalibrated, but either one of these would be good for sure. Other sizes may work also.

Only if the tire size was something they offered for that year of truck. Otherwise, you'll need a Blackbear tune (or AutoCal with BB tune), a Diablo handheld or Superchips programmer.

bhsballer76 · July 12, 2011

Is this something the local Chevy service center could/would do?

jimbrown1 · July 12, 2011

Is this something the local Chevy service center could/would do?

They can only recalibrate the PCM for a tire size that was offered on the vehicle during that year, so most likely they will not be able to calibrate for a 20" tire since that was not available on that model year. If you had a 2008-2011 and it came with 17" wheels/tires from the factory and went up to the 20" wheel/tire and it was an OEM size (i.e., 275/55/20) the dealer would be able to calibrate the PCM for the tire change. Look at a BB tune or a Diablo or Superchips handheld. The cost for a dealer recalibration is probably close to what a handheld costs.