## What's the rpm difference at 130 km/h in ML320 and ML230?
Final gear ratio means the tires turn x times less than the engine crank shaft.
Here are 130 Kilometers per hour converted to x Kilometers per minute
Note that the tire on the ML320 is slightly smaller than the ML230 tire !! Dividing Kilometers per minute by the tire circumfrence gives us the revolutions per minute of the wheel
Revolutions of the wheel per minute times the final ratio gives us the engine rpm
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