Specification Brand : equlup BulletPoint1 : APPLICABILITY: The pinion gear's external dimensions are accurately designed to fit the gear motor, stable operation after installation, suitable for most common bicycle chains, good replacement for old or damaged sprockets BulletPoint2 : STABLE PERFORMANCE: The metal sprocket motor pinion gear is manufactured with stable performance and high reliability, the inner diameter is about 11mm/0.4 inches and the diameter is about 40mm/1.6 inches, it is a suitable accessory for the gear motor, quick installation BulletPoint3 : EASY TO INSTALL: The scooter motor sprocket chain is easy to install replacement parts, easy to operate, use with confidence, stable performance, suitable for replacing old parts and bad parts, can provide you with a good user experience BulletPoint4 : APPLICABLE MOTOR: The sprocket motor pinion is suitable for MY1016Z2, MY1016Z3, MY1018 geared motors, please confirm the motor model number before use, the 428 9T chain motor pinion is an ideal accessory for bicycle enthusiasts BulletPoint5 : HIGH STRENGTH CARBON STEEL MATERIAL: Bicycle motor sprocket is made of high quality carbon steel material, sturdy, water-proof, high hardness, not easy to break, not easy to fade, able to withstand extreme outdoor weather, and long service life ItemName : Bike Motor Sprocket, 428 9T Chain Motor Pinion Gear Sprocket Motor Pinion Carbon Steel Sprocket for MY1016Z2 MY1016Z3 MY1018 Geared Motor ItemPackageDimensions_Height : 1 centimeters ItemPackageDimensions_Length : 15 centimeters ItemPackageDimensions_Width : 11 centimeters ItemTypeKeyword : roller-chain-sprockets Manufacturer : equlup ModelNumber : equlupe5dvrb2fk1 NumberOfItems : 1 PartNumber : equlupe5dvrb2fk1 ProductDescription : Item Type: Chain Motor Pinion Gear Material: Carbon Steel Gross Weight: 43g / 1.5oz Inner Diameter: Approx.11mm / 0.4in Diameter: Approx.40mm / 1.6in