Final gear ratio

[justafarmer]

Hellos
Buddy working on a 74 cb750sohc chop. He wants to run a 16inch rear. Rough figuring a 10 percent size difference i suggested a 18/41 drive set. Would that be too tall of gearing

 

[dirtdigger]

I am running a 17" sport bike wheel with the typical lower profile tire. I have 46 tooth rear and gets me right in the middle of the rpm range. A lot also depends on engine size, if its bored it can handle a little taller gearing but the 750 still likes to run mid range in the rpm.

 

[justafarmer]

Thanks dirtdigger. It stone stock 750sohc guessing 25k miles. Too much conflicting info on the net lol. I know with my 78 ss 17/45 runs around 4300 at 60. But who goes that slow. It was much happier closer to 5000. Some say 60 at 4000 is high