Update : I have located the CTC owners manual . Brand ( China generic ) : Strong GT-S210 , 36V-SLA 12AH , Maximum power output : 500W , Mominal PO : 200W , Maximum RPM : 230 , top speed 28KPH .
Spent some time tracking brand a year ago . Its a useful frame design as the rear triangle can be traded out for a narrower hub , match mounting pin bolt to its own triangle , they vary . Original hub width is 176mm inside ( see above post ) .
Stock triangle BB tube frame is 182mm ( cheap swaps are 168mm ) , so you will need a longer peddle axle to clear the battery down tube framing . Stock axle measured on outside cranks is 173mm , a substitute axle from a kiddy Minimoto Hybrid fits if you use the stock crank . Its 185mm , both are measured with peddles on , a challenge to locate both exact axle sizes in the secret parts stash .
A crank upgrade to larger sprockets needs the longer axle or bolt one to the stock crank . 56T will clear , but a an old 10 speed T56 won't fit due to striaght peddle arms , hits the side frame .
Battery boxes still hold 28 lbs after 5 years , good plastic and anchor glue ( scarey 4 fasteners ) .
Dual wall rims 30mm deep , 29mm wide outside . 2mm + a bit more spokes , guess its 2.2mm .
Stem fits 1.125" forks ,good pitch . Frame size is large , usual CTC stock .
