Tire size differences...how much is acceptable for ABS and differential?
This is for my 2002 GMC Sierra 1500 4x4.
I have acquired one new and four used tires specified at the same size as eachother. All are 265/70-16. Two are the same model as the one new one (BFG Rugged Trail) and two are Dunlop Grantrek AT21.
I rolled them out and these are the results for the 5 tires I have, measured in inches of circumference and calculated to Revolutions Per Mile:
- 1 @ 670.476 RPMi (94.5") - the new BFG
- 1 @ 673.326 RPMi (94.1") - BFG
- 1 @ 675.84 RPMi (93.75") - Dunlop
- 2 @ 676.923 RPMi (93.6") - one each of the BFG and Dunlop
Am I overthinking this? Should I just shove 'em on the truck and enjoy having one new tire? What position should I use the new tire in?
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