Tandem pushchair recommended minimum age 6 months pushchair weight 15 kg carrycot pushchair seat harness system 5 point safety harness slider adjustable series graco stadium duo wheel settings swivelling lockable wheel type solid rubber tyres wheel diameter rear 22 cm wheel diameter front 21 cm number of wheels 4 footrest adjustable dimensions 113 x 57 x 100 cm dimensions folded 66 x 57 x 109 cm included in delivery pushchair seat shopping bag