Folding bicycle fork dahon handlebars kinetix comp approximate folding time 10 seconds dimensions of bike when folded 26 x 78 x 66cm one frame size only wheel size 20 inch series dahon mu uno colours orange black folding time 10 seconds dimensions folded 31 x 65 x 78 cm frame material aluminium frame alloy 7005 aluminium braking systems rim brakes coaster brake brake type dual pivot brakes kinetix tour gear system none number of gears 1 wei