Trying to determine what my cruising RPM's are. Someone suggested using the attached calculator, however I am a bit foggy when it asks for the tire information, specifically aspect ratio and WHEEL diameter.

I have no idea what aspect ratio is and I believe the wheel diameter is 16 inches. I am confused as I am thinking that the outer diameter of the tire be the key measurement here, not the wheel.

Any thoughts,

http://www.nightrider.com/biketech/calc_speed_rpm.htm

 

100/90/17

100 tire width
90 aspect ratio
17 wheel dia.

 

try this one.might be easier for you
http://www.bigboyzcycles.com/Gearratio.htm

 

Thanks, but now I am even more confused. Why 100 tire width when my tire is a 130? What is apect ratio and why 17 inch wheel diameter and I have 16" wheels?

 

With your stock 130 tire,just punch in 130 width, aspect 90, dia 16. should be it.

 

100/90/17 was just an example...