Sport buggy recommended minimum age 6 months frame material aluminium backrest multiple brakes locking brake canopy adjustable harness system 5 point safety harness padded seat belt handlebar height 99 cm folding mechanism one hand fold collapsible wheel settings front swivel wheels wheel diameter rear 13 cm wheel diameter front 13 cm number of wheels 4 max load 15 kg dimensions 85 x 49 x 99 cm dimensions folded 49 x 56 x 28 cm seat width