Question for the dudes out there with OEM ZR1 tires or a ZR1 and HPtuners.
Recently I installed ZR1 rims on my Z06 and I thought I should change the tire size to the 26.6" size.
What tire size comes in the ZR1 PCM from the factory? Thanks in advance.
The OEM ZR1 rear tire is 26.6" in diameter, 782 revolutions per mile. An OEM Z06 rear tire is 26.7" in diameter, 783 revolutions per mile. At that size, you really don't need to worry about changing anything in the calibration for your speedometer.
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My stock Z06 file said 26.16 and 770.88Originally Posted by DSteck
What does a stock Z06 file say under the Speedo area in HP Tuners?
Z06 and ZR1 are both 26.16 in the file.
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