angrenaj copii/tineret quantity of teeth28 teethcrank length 114 mm weight580 gmounting Direct Mount execution Narrow Wide number of speeds rear 9 speed 10 speed 11 speed 12 speed number of speeds front 1 speed for/with bottom bracket type for JIS - cotterless axle Offset 9 mm material of crank aluminium material of chain ring steel details with chain guard chain segmentation 1/2" chain interior width 3/32" 11/128" chain line50 mmapplication range kids bike target group children youth