I'm a victim of dumb luck. I was so successful in mating a 1 HP BLDC motor, and a Nuvinci 171 auto shift to a rescue mini bike frame that I have a real, really efficient, hill climber.
https://endless-sphere.com/forums/viewtopic.php?f=12&t=89188
But I'm greedy, and want some more top speed with it. All of the 2 speed shifters I can find involve the use of a jackshaft, and between chaining from my motor to a jackshaft to my Nuvinci to wheel sprocket, I don't have the room for another jackshaft. So, what I would like is a mini bike, manual, 2 speed IGH, with a drive ratio of between ~1.6 and 2.0. I find that I have enough twist to use such an IGH as a transfer case, with "high" and "low" settings, just like my 4wd truck. My Nuvinci only "sees" the speed of it's output sprocket, so it would shift at the same motor rpm it's programmed to shift at (explained in my link) , no matter the position of the IGH. Again, just like my truck.
Not askin' for much, eh? I know, I know....
https://endless-sphere.com/forums/viewtopic.php?f=12&t=89188
But I'm greedy, and want some more top speed with it. All of the 2 speed shifters I can find involve the use of a jackshaft, and between chaining from my motor to a jackshaft to my Nuvinci to wheel sprocket, I don't have the room for another jackshaft. So, what I would like is a mini bike, manual, 2 speed IGH, with a drive ratio of between ~1.6 and 2.0. I find that I have enough twist to use such an IGH as a transfer case, with "high" and "low" settings, just like my 4wd truck. My Nuvinci only "sees" the speed of it's output sprocket, so it would shift at the same motor rpm it's programmed to shift at (explained in my link) , no matter the position of the IGH. Again, just like my truck.
Not askin' for much, eh? I know, I know....