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Ray Gottry · 07-20-2021, 07:27 AM

RPM X C
_______ = MPH

G X 1056

MPH X G X 1056
______________ = RPM

C

MPH X G X 1056
_____________ = C

RPM

RPM X C
____________ = G

MPH X 1056

RPM = REVS PER MINUTE

C = TIRE CIRCUMFRUNCE (UNLOADED)

G = GEAR RATIO

MPH = MILES PER HOUR

You can move the numbers around in the formulas to tell differences of changes. Has worked great for me.

Not real scientific but fun.

07-20-2021, 07:27 AM	#6
Ray Gottry Junior Member Join Date: Feb 2019 Location: Lake City, Fl. Posts: 61 Likes: 101 Liked 68 Times in 24 Posts	Re: gear change RPM X C _______ = MPH G X 1056 MPH X G X 1056 ______________ = RPM C MPH X G X 1056 _____________ = C RPM RPM X C ____________ = G MPH X 1056 RPM = REVS PER MINUTE C = TIRE CIRCUMFRUNCE (UNLOADED) G = GEAR RATIO MPH = MILES PER HOUR You can move the numbers around in the formulas to tell differences of changes. Has worked great for me. Not real scientific but fun.