Tongxin used to offer motor builds in the following specs, http://www.tongxin.net.cn/en/other.htm
In light of the Chinese ebike domestic max speed going up from 12 to 15.5 mph, are the lower speed motors still offered, if so, they are the only small motors below the now common 201 rpm.
I have the 175 rpm model laced into a 26'' wheel. (13.7 mph top) It is an excellent all round motor set up as I found riding it again lately, makes most hills like pedaling a non powered bike on the flat. The motor dealer recommended it, but I see from the above link that the actual Tongxin spec for my wheel size was 160 rpm!
Maybe if the rider weighs more than my 93 Kg &/or carries a lot of shopping on the bike the 160rpm would be needed. As the torque is quoted a t 20 Nm & on the above chart the speed always remains @ 20 Kph, I am guessing that there was a different reduction gear set fitted proportional to the increasing wheel radius, thus speed & rim pull remained constant no matter what rim was selected.
Jerry, or anyone else here have up to date info re. this? Pete
In light of the Chinese ebike domestic max speed going up from 12 to 15.5 mph, are the lower speed motors still offered, if so, they are the only small motors below the now common 201 rpm.
I have the 175 rpm model laced into a 26'' wheel. (13.7 mph top) It is an excellent all round motor set up as I found riding it again lately, makes most hills like pedaling a non powered bike on the flat. The motor dealer recommended it, but I see from the above link that the actual Tongxin spec for my wheel size was 160 rpm!
Maybe if the rider weighs more than my 93 Kg &/or carries a lot of shopping on the bike the 160rpm would be needed. As the torque is quoted a t 20 Nm & on the above chart the speed always remains @ 20 Kph, I am guessing that there was a different reduction gear set fitted proportional to the increasing wheel radius, thus speed & rim pull remained constant no matter what rim was selected.
Jerry, or anyone else here have up to date info re. this? Pete