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Yamaha, Yamaha xv750, Yamaha xv920, Yamaha Virago, Virago, Euro, Big Twin Street V-Twin, slash cut jardines, chrome dual air cleaner mod, dual front brake mod, front end drop
Here is the ultimate conversion tool.

http://viragotech.com/Conversi.exe




Still working on this page but still useful.

Equations

The following equations and rules apply only to 4-cycle engines powered by pump gasoline.
The equations have been simplified for ease of understanding.
Answers will approximate, but generally close enough for use as a guideline.

It is recommended that you round your result to the nearest hundreth, ie. 4.118325 = 4.12

Gear Ratio= Rear Axle ratio multiplied by Transmission gear ratio.

(Tranny list below) Ex: 3.08*1=3.08 (rear axle=3.08)

Tire Radius= Distance, in inches, from the center of the tire to the ground.

MPH

Tire Radius RPM Rear End Ratio Transmission Gear Ratio =MPH

RPM

Rear End Ratio Transmission Gear Ratio MPH Tire Radius =RPM

Calculated Gear Ratio (Trans. gear multiplied by rear end gear)

Tire Radius RPM MPH =Gear Ratio

Transmission Gear (relative to variables of calculated gear ratio equation)

Calculated Gear Ratio Rear end ratio =Transmission gear ratio

Rear end gear (relative to variables of calculated gear ratio equation)

Calculated gear ratio Transmission gear =Rear end gear

Tire Radius

MPH Rear End Ratio Transmission Gear Ratio RPM =Tire Radius



This tire size calc has a visual display.
Side or end view.

http://www.miata.net/garage/tirecalcold.html



Could use some help gathering up all the info needed below.

Final Drive
Engine code 1st 2nd 3rd 4th 5th
US
XV125
XV250
XV400
US
XV500
XV700
3.43 81-83
XV750
2.4 1.7 1.3 1.0 0.9
XV920
US
XV1000
XV1100
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