OT: Motorcycle guys, need help w/formula., Formula for figuring out MPH. |
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OT: Motorcycle guys, need help w/formula., Formula for figuring out MPH. |
Air_Cooled_Nut |
Apr 10 2007, 01:46 PM
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#1
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914 Ronin - 914 owner who lost his 914club.com Group: Members Posts: 1,748 Joined: 19-April 03 From: Beaverton, Oregon Member No.: 584 Region Association: None |
Found while searching the vast internet:
Speed = (RPM x rear tire circumference x front sprocket) / (primary gear ratio x selected gear ratio x rear sprocket x 1056) Is this correct? Where does the "1056" number come from (IMG:style_emoticons/default/confused24.gif) This is different from the automotive one I have: Speed = (RPM x rear tire circumference) / (R&P x selected gear x 336) |
Crazyhippy |
Apr 10 2007, 09:42 PM
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#2
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Insert witty comment here... Group: Members Posts: 1,659 Joined: 28-July 05 From: Home of the Coyotes, AZ Member No.: 4,493 Region Association: None |
Appears to be correct, not sure where the 1056 comes in... conversion from inches of tire circumfrence to MPH perhaps?
Also note the tire circumfrence changes pretty drastically w/ a bit of lean so 6000rpm straight might be 120mph, but 6000rpm dragging knee might only be 90mph... BJH |
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