Pro-tek rear sprockets are completely constructed on precision CNC machines from 7075 T6 aerospace quality aluminum. We do not gear hob the teeth. This maintains concentricity with the hub diameter since both are cut at the same time. The teeth are machined to above the latest industry standards creating an accurate tooth profile that fits precisely on the chain rollers. This insures maximum chain and sprocket longevity and a more efficient power transmission. We then increase durability by brite-dip anodizing each sprocket is violet finish for protection from corrosion. Made in the USA, normally retail for $59.95. This is for a 520 Pitch rear sprocket 38 tooth in violet anodizing. Fitment: PM Chicane Rim, Bolt Circle: 6 Bolt 88.9MM, Bolt Hole Diameter: 9.9MM, Hub ID: 63.5MM Please keep in mind this is a 520 Pitch 38 tooth rear sprocket and some of the applications are stocked with either 530, 525 or 520 pitch. Please check the chart below for accurate fitment with stock applications and conversions for your bike. Thank You! HTTPS://www.protekk.com/media/documents/sprocket_app_chart.pdf Please make sure you check your diameter and Hub ID, these are for aftermarket rims and not stock, there are No returns on this item so check application chart above. Track Page Views With Auctiva's FREE Counter