Vortex Rear Sprocket Yamaha YFZ 450, YFZ450 Years: 2006-2024 Pitch / Teeth: 520 Conversion, 38-50 Teeth Rear Aluminum ORDERING INSTRUCTIONS: Refer to the sprocket tooth counts available above. When paying write the SPROCKET TOOTH COUNT AND COLOR you want in your PayPal payment notes. For example: if you want a 40 tooth blue sprocket write: "40 TOOTH BLUE" in the notes to seller section of your PayPal payment. You can also email us your sprocket tooth count and color information before / after check-out. Because we use stock pictures, your sprocket may be different because of the positioning of the holes and number of holes. Vortex Rear Sprocket Fitment: Yamaha YFZ 450, YFZ450 Years: 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 Pitch: 520 Conversion Teeth: Available in 38-50 Teeth (Please specify) Color choice: Blue, Black or Red ORDERING INSTRUCTIONS: Refer to the sprocket tooth counts available above. When paying write the SPROCKET TOOTH COUNT AND COLOR you want us to ship in your PayPal payment notes. For example: if you want a 40 tooth blue sprocket write: "40 TOOTH BLUE" in the notes to seller section of your PayPal payment. You can also email us your sprocket tooth count and color information before or after check-out. Sprocket Features: Lightweight high-performance alternative to the stock steel sprocket Considerably reduce mass and allow you to change your gearing. Made with the highest quality aluminum 7075 T6 aluminum is the best grade material for light weight and durability The weight you save on drive components is multiplied as rotating mass Less rotating weight improves acceleration CNC Machined to tightest tolerances Their unique manufacturing process creates a perfectly concentric sprocket every time This frees horsepower and extends the life of both the chain and sprocket Perfected tooth design has less drag and reduces friction for better acceleration and deceleration Attractive, Smart Design Vortex patented design offers a unique look Mud grooves and coating help keep components clean We are an authorized Vortex dealer.