Gear ratio?

ram250098 said

I borrowed my buddies GPS and at 100kph or 62 mph my tach is reading 4000. Now with 24" tires what am I looking at for a gear ratio? I am getting 4:61 is that right?
Thanks
AL

Click to expand...

Yep that's right or the GPS is lying or the tach is off. The tires can't lie IF you measured them correctly. lol

See you can use the same forumla to find RPM.

GEAR X MPH X 336 / TIRE SIZE = RPM