Sport buggy recommended minimum age 6 months pushchair weight 132 kg reversible seat brakes handbrake canopy viewing window harness system 5 point safety harness suspension slider adjustable handlebar height 83 109 cm folding mechanism collapsible wheel settings swivelling lockable wheel type air chamber wheels wheel diameter rear 27 cm wheel diameter front 19 cm number of wheels 4 max load 15 kg safety bar with bumper bar footrest adju