Folding bicycle wheel size 20 inch series tern link colours black white grey folding time 10 seconds dimensions folded 38 x 79 x 72 cm frame material aluminium frame alloy 6061 aluminium braking system rim brakes brake type v brakes fork stahl gear system internal gear hub number of gears 7 weight 134 kg rear derailleur shimano nexus tyres schwalbe big apple saddle biologic como dlx features with mudguards with luggage rack hub dynamo li