- Joined
- Jul 4, 2014
- Messages
- 1
Hi,
this is my first post on the forum, however I'v been lurking around for some time and picked up incredible amounts of useful information about e-bikes, bike-kits batteries and so on.
So time to give back a little contribution.
Last year I bought a GNG Gen1 BB drive kit and mounted it on my Fuji Hybrid Commuter. I was really happy with the kit except from the terrible quality of the frewheeling crank (I think someone here mentioned it was made from butter
). During the first 6 months I replaced the freewheel 3 times.
Since I anyway don't just drive without pedaling, I figured I'd have an attempt to combine the sprockets from GNG freewheel crank and a standard Shimano Crank in order to eliminate the weak point.
So I found that:
* GNG sprockets have 4 6mm holes with a BCD of 64 mm
* Shimano FCM361 Crank has BCD of 104mm for the two outer sprocket and BCD 64 mm for the inner sprocket
So I ordered a Shimano FCM361, drilled up the holes in the GNG sprocket to 8mm and replaced the inner sprocket of the crank with the GNG sprocket, took off the sprocket in center, and shifted the outer sprocket into the position of the center sprocket.
Result:
* Perfectly aligned outer sprocket with the motor sprocket.
* The inner GNG sprocket used for chain to rear wheel.
* No freewheel.
PS: Remember to not touch the throttle when not pedaling
Best regards
Jarle
this is my first post on the forum, however I'v been lurking around for some time and picked up incredible amounts of useful information about e-bikes, bike-kits batteries and so on.
So time to give back a little contribution.
Last year I bought a GNG Gen1 BB drive kit and mounted it on my Fuji Hybrid Commuter. I was really happy with the kit except from the terrible quality of the frewheeling crank (I think someone here mentioned it was made from butter
). During the first 6 months I replaced the freewheel 3 times. Since I anyway don't just drive without pedaling, I figured I'd have an attempt to combine the sprockets from GNG freewheel crank and a standard Shimano Crank in order to eliminate the weak point.
So I found that:
* GNG sprockets have 4 6mm holes with a BCD of 64 mm
* Shimano FCM361 Crank has BCD of 104mm for the two outer sprocket and BCD 64 mm for the inner sprocket
So I ordered a Shimano FCM361, drilled up the holes in the GNG sprocket to 8mm and replaced the inner sprocket of the crank with the GNG sprocket, took off the sprocket in center, and shifted the outer sprocket into the position of the center sprocket.
Result:
* Perfectly aligned outer sprocket with the motor sprocket.
* The inner GNG sprocket used for chain to rear wheel.
* No freewheel.
PS: Remember to not touch the throttle when not pedaling
Best regards
Jarle
