Folding bicycle wheel size 20 inch series tern link colours blue orange white black red folding time 10 seconds dimensions folded 43 x 72 x 84 cm frame material aluminium frame alloy 6061 aluminium braking system rim brakes brake type v brakes gear system derailleur number of gears 8 weight 124 kg rear derailleur dahon neos 10 cassette sunrace rear chain wheel teeth 12 32 tyres schwalbe citizen saddle velo sport maximales fahrergewicht