Crank diameter

[spdracr0]

What is the effective diameter of the stock crank pulley? Doing some quick blower math. Thanks

 

[REDS197]

Crank Pulley-----TVS Pulley---------RPM Ratio-------RPM@7500

6.78----------72mm-2.8 inch----------2.4-------------18000
---------------69mm-2.7 inch----------2.5-------------18750

7.88----------72mm-2.8 inch----------2.8-------------21000
---------------69mm-2.7 inch----------2.9-------------21750