im far from done. pulleys, especially a custom made one to mount to this adaptable freewheel i have with 4 bolt holes, that i then will mount to the uber rare, no longer made i think, dual drive hub from profile racing...is expensive. all n all a pulley set up is likely to cost maybe 8x more than a chain set-up. but im still in it.
for the motor i got doing 5hp and 7000rpm going through two belts and a jackshaft with two 3.1:1 reductions to the rear 24” wheel a 8mm pitch 12mm wide belt is more than adequate. so 12mm and add some flanges and its 21mm wide and 450-500$..just for that one custom pulley. so looking to china. the two smaller 22-24 tooth would be like 70$ each and the bigger 70 tooth are like 150$ minimum. thats before gettting the "bushings" that mount them, unless you want to mess with set screws or pins and that trouble. in hindsight i wouldnt have gone into this if i knew it was going to be possibly 1000$ just for the drive system. but china seems to do "gt" compatible pulleys (higher torque) so who knows and will find out tonight the overall china pulley cost. ill add it in this post and not add any more to this thread till something monumental happens.
i have spent a lot of time figuring how to pot the cells and what to pot them in that can also be used as a motor mount. it need be both flexible enough to not crack from the cell's slight expansion yet not so flexible as to bend from the torque of the motor so settled on a 95duro pu that i'll strategically add carbon to.
the plan is to pot just the battery and mounting bolts. ill pot them when i have a completed aluminum motor mount plate that i will bolt it to, and when its here i'll use the aluminum plate to orient the mounting bolts as the resin sets.
if it spins on the downtube i can add a keyway or simply pour some resin down the crack.
and a pic of a bike frame you could add a belt without needing to have a breakable frame. was thinking be nice to do that and run a bearing inside a bearing, internal and external bearings in the bottom bracket shell, so could run the motor jackshaft through it and also have cranks and pedals...and maybe somehow add a rachet to pedal..so only need one belt going to rear wheel. maybe one day
https://imgur.com/a/ZyT1Fvg
I’m still going to strip the wraps off all the cells and dip them in epoxy. Otherwise the steel cell, which I think could be a functional constructive part is a weakness
24” wheels. Suspension fork for 26” wheels. Super long seatpost.