Phil,
OK ... if you are turning 70 mph at 3800 RPM .. with 14/37 ft/rr teeth
sprockets then the rolling diameter of your 18 inch rear tire is 13.49
inches, (Wow ... an inch larger than a stocker). Your overall gear
ratio with this sprocket combination is 4.35 in 5th gear .. just for
comparison purposes .. your overall gear ratio in 5th on a stock 10/33
tooth differential driveshaft bike would be 4.70 .... Soooo .. you
have a taller tire and you are geared higher.
If I remember the original question ... "what would a stock driveshaft
Vmax be turning if you put the same 18 inch wheel on it" .....
It would be turning 4100 RPM in 5th gear, (300 RPM higher due to the
lower gearing).
If you then turned around and put a "stock" rolling radius 15 inch
tire, (12.47 inches), back on the same driveshaft bike you would be
turning 4433 RPM, (even faster due to the smaller rolling radius
tire).
If you knocked the owner of the driveshaft Max out ... stole his 12.47
inch rolling radius tire and bolted it onto your U-2 Max, (remember
Francis Gary Powers), as you were driving away you would be doing 4110
RPM at 70 mph in 5th gear.
What else ... what else ... ??!??!
campbell
----- Original Message -----
From: "Phil" <[EMAIL PROTECTED]>
Subject: Gear Ratios etc....
> Ok TC, I found out that the front sprocket is a 14 tooth and
> the rear is now a 37 tooth. I ran 70 MPH at around 3800 RPM.
> I have an 18 inch 180 tire on the rear. What else do you need
> to know to do these various calculations ?
> snip <
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