18 TEETH FREEWHEEL SPROCKET COG SINGLE SPEED BIKES ROADSTER ,FOLDERS, BMX KIDS18 TEETH FREEWHEEL ( ALSO CALLED A SPROCKET OR COG ) IS SUITABLE FOR ANY BIKE NEW OLD , MODERN ,ANTIQUE , ADULT , CHILDRENS , RALEIGH, TRIUMPH BSA,RUDGE, ETC ETC ETCWORKS WITH A NORMAL 1/8″ CHAINFITS CHILDRENS CYCLES OF ALL SIZES AS WELL AS ADULT BIKES INCLUDING FOLDERS, SHOPPERS ,TOURIST BIKES BMX ETC.WE ALSO HAVE OTHER FREE WHEELS LIKE THIS WITH 16 , 20 & 22 TEETH PLEASE SEE OUR OTHER LISTINGS OR IF YOU CANNOT FIND THE LISTING PLEASE US