ZR-1 Net Registry Forums - View Single Post

WVZR-1 · 08-02-2014

I thought I'd keep this in a different post but you should be able to calculate your actual tire diameter using a formula also OR maybe just use it to confirm your measurements. Tach would need to be very accurate.

MPH X gear ratio X 336 / RPM

In the above 60 MPH X 3.45 X 336 / 2960 = 25.4 (a match to what I measured years ago) and Dominic's 60 X 3.73 X 336 / 2864 = 26.25 (what Dominic mentioned measuring)

Clint, you could use this formula with your tires already mounted and measure to confirm.

Cliff - I'm guessing my numbers maybe passed your test.

08-02-2014	#169
WVZR-1 Join Date: Oct 2004 Posts: 1,889	Re: 4.10 gears...not what I expected. I thought I'd keep this in a different post but you should be able to calculate your actual tire diameter using a formula also OR maybe just use it to confirm your measurements. Tach would need to be very accurate. MPH X gear ratio X 336 / RPM In the above 60 MPH X 3.45 X 336 / 2960 = 25.4 (a match to what I measured years ago) and Dominic's 60 X 3.73 X 336 / 2864 = 26.25 (what Dominic mentioned measuring) Clint, you could use this formula with your tires already mounted and measure to confirm. Cliff - I'm guessing my numbers maybe passed your test. Last edited by WVZR-1; 08-02-2014 at 11:21 PM.