Sport buggy recommended minimum age new born pushchair weight 8 kg frame material aluminium backrest 5 positions harness system 5 point safety harness slider adjustable wheel settings swivelling wheel type solid rubber tyres wheel diameter rear 17 cm wheel diameter front 17 cm number of wheels 4 max load 17 kg safety bar with bumper bar footrest adjustable dimensions 85 x 52 x 105 cm dimensions folded 101 x 32 x 30 cm colour grey include