well according to ritchey it was designed with 28/38/48 crankset in mind
but i don't know what that means standards wise as this is the current chainring distance i have now i have now
Trek 7.7 fx, 22.5" frame, 38x700c,10 gears.
ecospeed mid drive 1300 watt engine, max speed 45 kph.
battery1: 48v 14 ah, frame mounted battery, range 40km.
battery2(spare) 52v 10ah frame mounted bag, range, 30km.