Tandem pushchair recommended minimum age 6 months pushchair weight 135 kg carrycots pushchair seat second seat backrest multiple harness system 5 point safety harness slider adjustable series mountain buggy one wheel settings swivelling lockable wheel type air chamber wheels wheel diameter rear 31 cm wheel diameter front 31 cm number of wheels 3 safety bar with bumper bar footrest adjustable colour red included in delivery second seat pus