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G30's with staggered rims don't have tires with the same circumference, so I wouldn't worry about it. Here's the 19's and 20's staggered front/rear the 540 xDrive:
Specification Sidewall Radius Diameter Circumference Revs/Mile Difference
245/40-19 3.9in 13.4in 26.7in 83.9in 755 0.0%
275/35-19 3.8in 13.3in 26.6in 83.5in 759 -0.5%
Specification Sidewall Radius Diameter Circumference Revs/Mile Difference
245/35-20 3.4in 13.4in 26.8in 84.0in 754 0.0%
275/30-20 3.2in 13.2in 26.5in 83.2in 761 -1.0%
Last edited by runbuh; 03-14-2020 at 07:31 PM..
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