ITEM NAME:18T Teeth 17mm 428 Chain Front Sprocket Cog for Pit Quad Dirt Bike Description: - Teeth: 18T; Chain: 428 Chain - Diameter of Sprocket / Cog: around 76mm/3" - Distance Between Mount Hole(centre to centre): around 30mm/1.18" - Diameter of Centre Hole: around 17mm/0.78" - Fitment: for 110cc 125cc 140cc PIT PRO PIT Bike Trail Bike Dirt Bike Thumpstar Package Included: 1 Piece Front Chain Sprocket Cog Note: 1.We provide clear pictures, measurements where possible. Please check as much as possible to make sure the item is the one that you need. 2. Please allow 0.5-1 inch difference due to manual measurement.(1 inch=2.54cm) 3. Instruction is not included. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Please understand,Thank you..Teeth: 18T; Chain: 428 Chain. 1 Piece Front Chain Sprocket Cog. - Distance Between Mount Hole(centre to centre): around 30mm/1.18".