Sunstar Steel Front Sprocket - 18T , Sprocket Teeth: 18, Color: Natural, Sprocket Position: Front, Sprocket Size: 530, M Manufactured from case-hardened chromoly steel for the ultimate in strength and durability. Parkerizing surface treatment for rust and corrosion resistance. The excellent OE quality you expect from the SUNSTAR brand. GS550E 80 with spoke wheels GS550E 78 to 80 with mag wheels