... folding bike 1, light weught and small size 2,material: magnesium alloy 3,li-battery 36V, 7/8/9/10 A ... MATERIAL:magnesium alloyFOLDING SIZE640X280X810mmEXTENDED SIZE1255X490X1090mmWEIGHT≤23kg (including battery)MAX LOAD 75kgWheel SIZE300mmbrakedrum ... CAN HOLD IT UP.3, THE BIKE IS MAINLY USE MAGNESIUM ALLOY, ANTI CORROSION, ANTIQUAKE, with tenacity.4,A NEW DESIGN ...