Sport buggy recommended minimum age 6 months pushchair weight 85 kg frame material aluminium backrest multiple brakes locking brake canopy adjustable harness system 5 point safety harness suspension handlebar height 101 cm folding mechanism one hand fold collapsible self standing wheel settings removable front swivel wheels wheel diameter rear 24 cm wheel diameter front 17 cm number of wheels 4 max load 15 kg safety bars removable with bump