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Thumper · 07-05-2023, 07:50 AM

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!

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07-05-2023, 07:50 AM	#8
Thumper Join Date: Feb 2021 Location: Kansas City Posts: 2,238	Done, final drive ration 0.3 ! 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! __________________ -2022 5 speed Templar X Orange, OEM 51T rear sprocket, 14T front sprocket -NOS 2020 KTM 250SX (2-stroke motocross), less than 10 hours on it Last edited by Thumper; 07-05-2023 at 09:12 AM.
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