dchevygod
Member
- Local time
- 12:07 PM
- Joined
- Mar 7, 2011
- Messages
- 473
I was run off the road yesterday at about 40mph and hit a big pothole! The damage is significant, my rear wheel has a big dent/flat spot, the mount plate is bent putting the chain/sprocket in a bind and that toasted the worn 5:1 pocket bike trans when I tried to keep going on to work :,(
I'm forced to put my custom FD mount back into action. I modified it but never used it before changing the plan and building my gebe style custom. I know its a good platform though.
So the FD is just a temporary solution.
I need to design a shifter, so my question is. If I use the 5:1 reverse rotation reduction is there a 6 spline drive sprocket small enough to use on my trans that will drive a shimano mega range 7spd cluster at a decent climbing ratio? I first thought that I'd have pedal power on the left side but I guess you need to pedal to shift correctly. So a freewheel crank will need to be utilized. But only one chain from cranks to drive sprocket then to 7spd cluster in a big triangle. Rack mounted because that's my preference.
The diy shifters I've seen also use the freewheel crank as a jackshaft reduction and I want to avoid that. I just need to know if 5:1 is enough motor reduction on a shifter. And I'll figure out the sprocket situation. If I have to make one or modify the 6spline shaft so a different sprocket will work, I'll get it done.
I'm forced to put my custom FD mount back into action. I modified it but never used it before changing the plan and building my gebe style custom. I know its a good platform though.
So the FD is just a temporary solution.
I need to design a shifter, so my question is. If I use the 5:1 reverse rotation reduction is there a 6 spline drive sprocket small enough to use on my trans that will drive a shimano mega range 7spd cluster at a decent climbing ratio? I first thought that I'd have pedal power on the left side but I guess you need to pedal to shift correctly. So a freewheel crank will need to be utilized. But only one chain from cranks to drive sprocket then to 7spd cluster in a big triangle. Rack mounted because that's my preference.
The diy shifters I've seen also use the freewheel crank as a jackshaft reduction and I want to avoid that. I just need to know if 5:1 is enough motor reduction on a shifter. And I'll figure out the sprocket situation. If I have to make one or modify the 6spline shaft so a different sprocket will work, I'll get it done.