Hillhater wrote: ↑Jun 12, 2018 4:56 pm
Thanks J&C, but that is always a compromise, and limits the choice of equipment for chain gear.
But whilst a single ring front will work for most road and trail situations,.... there are still times when off road you need that 23T front ring and 36T rear to haul through some steep track, rocks etc......yet still cruise back on the road with the 48/12 combo too.!
However , i have seen a dual front chainring set up for the Bafang i believe
I was just curious as to why the motor gearing is always on the RH side ?...im sure there is an obvious answer.
Its probably simpler to configure the crank clutch there ? ..but not impossible to have it on the left.
Gearing takes up space, how would you slide the motor through the bb with something on both sides of the shaft?
Assuming 26" x 2.25" tires your 48-23 front with 12-36 rear would put your high gear max speed at 90 rpm = 28.5mph, and you lowest gear max speed at 90rpm = 4.5mph. Now if you went with a 42 front and 11-50 rear your max speed would be 27mph highest and 6mph lowest.
If you can mount the derailler and cable you can run a dual chainring, others have done so. They even make a stock dual chainring for the tsdz2 which is for sale on alibaba. But do you really need 4.5? if you can get away with 1.5 mph less in high and 1.5mph more in low you can go with 11 speeds, and it would make shifting much easier. I prefer well spaced gears and simple shifting due to the added trouble of needing to clutch the motor or pausing your pedaling.