I had originally upgraded from 428H to 520 on this Storm
OEM gearing was 17T/46T =0.3696 final drive ratio
New gearing was 12T/35T =0.3429 final drive ratio
https://www.chinariders.net/showpost...99&postcount=1
I got him a 32T because he wanted to commute on it. So the final drive ratio was pushed back up to 12T/32T =0.375 (higher than original!)
This dropped the revs, but made it harder for him to get through the driving test.
I can't go lower than 12T on the front, and the biggest JTR279 rear sprocket I could get was a 40T. This drops the final gearing quite a bit though!
NOW, It's 12T/40T =0.300 final drive ratio
I put a new chain on too (RK 520H standard).
It creeps much easier in 1st gear now. He is practicing slow rolling now and will retake the driving test. I mounted a Tusk DSport last year on this bike. Now this bike is a goat off road. Awesome!