Sport buggy recommended minimum age new born pushchair weight 104 kg reversible seat canopy viewing window harness system 5 point safety harness slider adjustable handlebar height 98 105 cm folding mechanism 3d folding system collapsible wheel settings swivelling lockable wheel type air chamber wheels wheel diameter rear 27 cm wheel diameter front 27 cm number of wheels 3 safety bar with bumper bar footrest adjustable dimensions 82 x 64 x 1