and the mountain bikes and speedbikes should have good oarts inside like gearbox shimano must be hybrid recharging when you drive downhill without using pedal and supporting the manpower u use not completely without using own manpower and the electric support must be able to be switched off and must loook like normal bike not like motobike or strange cannot get same materials at cheap price and beach bikes or so for older people beach bikes and normal bikes with smaller W 200W or so