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Final Drive ratio
- Thread starter r1200rst
- Start date
kinterridge
Member
The 28 teeth on the splined flange is correct for a /2 (R50; R50/2; R60; R60/2; R69; R69S.). 4 options from what I can tell on the crown gear sets, if no stamping you'd have to count the teeth, 27:7, 27:8, 25:8, and the sidecar rig had 26:6.
To determine the ratio, I think it takes more than counting the teeth. Pick one of the teeth and turn the final drive exactly one revolution while monitoring how many turns the u-joint at the front of the drive shaft turns. Those number of turns of the front joint will let you figure out what the ratio is. It will be something like three full turns so 3.0/1 or 33/11. If it's slightly more than three full turns, it could be 3.125 or 25/8.
