Help with rev per mile calculation!!!

[Kaleza]

So i just installed FP tune on the car, and i was told that if i changed my wheel size i should change rev/mile with procal 4 device. So i found 6 different calculators, and three of them show 729 other three show 752. My tires are 275/40r19. Manufacturer website shows that tire diameter is 27.7. Tire racks shows tire diameter is 27.66. So im little bit confused, i think 729 is the right number, but any clarification would be welcome. Thanks

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[A.alansari]

Check @roket calculator

 

[86pagt]

Shows 729 on this website.

 

[Sofa King]

Do it yourself? The math is simple...
1 mile ÷ circumference = rev/mi
Convert mile to feet and circumference (diam x pi) to feet.

Tirerack also shows this value in the specs... that's what I used when I did mine the other day...

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