3 wheeler pushchair recommended minimum age new born pushchair weight 85 kg backrest 3 positions harness system 5 point safety harness slider not adjustable handlebar height 100 cm wheel settings swivelling lockable wheel type solid rubber tyres wheel diameter rear 20 cm wheel diameter front 18 cm number of wheels 3 safety bar with bumper bar footrest adjustable dimensions 91 x 56 x 100 cm dimensions folded 91 x 56 x 40 cm seat width 35 cm