Gear Ratio

[Bayouself69]

I have a question,I have a Dax Gear Box 3 to 1 my front sprocket is 14 tooth
my rear sprocket is 72 tooth what is my final drive ratio ?? I would like to find out how to figure this out.

 

[JonnyR]

if im doing it right the secondary reduction is the 14t to the 73t is 5.14:1 so with the 3:1 box its only 8.14:1 witch is still kinda high a 10 t drive would make it closer to 10:1 which would be what you are looking for
http://www.calcunation.com/calculators/machinery/mechanical power/chain-sprocket-ratio.php

 

[MotorBicycleRacing]

if im doing it right the secondary reduction is the
14t to the 73t is 5.14:1
so with the 3:1 box its only 8.14:1

You added the 2 ratios, but
You multiply ratios so the correct ratio is 15.43 to 1

 

[shwnrttr]

3-1box 14-72drive= 15.43:1

 

[JonnyR]

its 8.24 total reduction you add not multiply

 

[MotorBicycleRacing]

its 8.24 total reduction you add not multiply

Yeah, right.
Try the best gear ratio calculator if you don't believe us......

what is my final drive ratio ?? I would like to find out how to figure this out

Download gearratio.exe from:
http://jimsitton.net/ratiocalc/