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Yamaha YZF-R6 Ratio Pro allows you to select the optimal gearing for any track.

Ratio Pro for the Yamaha YZF-R6 is a quick and useful tool for racers and track day goers alike. Gear ratios are crucial to racing and R6 Ratio Pro allows you to select the optimal gearing for any track.

This calculator that lets you select sprocket and tire dimensions to see the effect they will have on top speed and RPM in each gear. This app lets you save sessions with your gearing/tire data along with track, times, weather and setup notes for later reference and comparison. Graphs of selected gear ratio and drop in RPM when shifting are also available for a quick visual reference of all data.

Select your front and rear sprockets, tire width, profile and rim sizes, then change the RPM to instantly see how it affects speeds at all gears. Switch between MPH or KmPH.

A gear speed graph displays the drop in rpm after shifting/at each shift point.

Save your settings for later reference and comparison; add weather, temperature, time and condition information and your own notes for each session. Go back and edit notes later if needed, or overwrite sessions entirely.

Send session information via email, or just save unlimited sessions in the app itself for later reference.