I changed it up again, before was temporary, this is going toward permanent setup now.
The bottom bracket is the older style with bearing balls on either side held in a cage, then the square taper axle, it is 68 and I'd guess the spindle length is 110'ish. Problem is when I tighten the Cyclone crank to proper torque spec, it hits the thread on bearing race. so when the motor is going it will spin the thread on locker. Just need a 68 x 122+ until the wider Cyclone bb comes in, whenever that is.
Been outta the game for a bit due to broken chains, miscommunication with the guy who sold me the 41T cog that normally bolts onto the spokes, but this one had the IS disc mount holes I had to enlarge because the China basement that made them, werent exact.
This is not ideal, 41T motor to 44/44T crank to 2nd largest cog maybe 28, no shifting capabilities yet (that RD is just a tensioner) That rear cass or F.wheel is a little pooched plus its friggin' old. Would pancake doing circles just like last week. I am either building a regular rear 26" or buying one from Chain Reaction Cycle.
That 41T disc mount cog is no good, has slow take off but very fast once up to speed, plus it heated up my motor pretty darn good, and I think it just eat up a ton of wh/kilometers, full charge these days should get me 18km and I only got 8km if I am lucky. It will suffice for another day then 16T time. GrinTech only sells one, the 16T and after playing around with the motor simulator thats probably all they will have, no need to go a higher tooth count.
I am done with this project, I rode around with a 16T mounted to the disc mount side of the motor and it was all fine, while the 41T got the motor hot to quickly. If I was going to make this permanent, I would have done the mount differently. Bottom of seat Tube to Top Bar and a 3rd from motor axle to seat clamp area with an adjustable threaded rod. Too much torque forces the motor down on 16T gear side then the chain would fall off the crank. I fixed mine by a simple adjustable threaded rod from just to the side of motor axle to a tube clamp on top bar.