The Dirt Tricks F1B-13 Front Countershaft Sprocket is a 13-tooth, 520-chain sprocket engineered for demanding off-road riding. Designed by Dirt Tricks president and engineer Greg Burns, this sprocket reflects extensive expertise in aerospace steels, heat treatment, and finite element analysis. Its tool-steel construction delivers exceptional strength and durability while maintaining a lightweight, minimalist profile comparable to aluminum sprockets.
Built for long service life, the Dirt Tricks F1B-13 sprocket is designed to withstand hard riding and resist wear throughout an entire season. Dirt Tricks sprockets are rated at 2.5 times the strength of stainless steel, providing dependable performance under high-load conditions. The sprocket is backed by Dirt Tricks’ one-year guarantee: if it wears out during the warranty period, Dirt Tricks will replace it.
Fitment: This 13-tooth front countershaft sprocket fits select Yamaha motorcycles, including the 2015-2017 Yamaha YZ250FX and 2005-2011 Yamaha YZ125. Verify the motorcycle model, year, chain size, tooth count, and countershaft configuration before installation. The manufacturer is Dirt Tricks, and the manufacturer and vendor part number is F1B-13.
Features:
- 13-tooth front countershaft sprocket for 520 chain applications
- Tool-steel construction engineered for high strength and extended wear resistance
- Designed using aerospace steel expertise, advanced heat treatment, and FEA stress analysis
- Minimalist design provides strong performance with a lightweight feel comparable to aluminum
- Rated at 2.5 times stronger than stainless steel
- Backed by Dirt Tricks’ one-year wear guarantee
- Fits 2015-2017 Yamaha YZ250FX and 2005-2011 Yamaha YZ125
Fitment:
2001 Yamaha WR250F
2001 Yamaha YZ250F
2002 Yamaha WR250F
2002 Yamaha YZ250F
2003 Yamaha WR250F
2003 Yamaha YZ250F
2004 Yamaha WR250F
2004 Yamaha YZ250F
2005 Yamaha WR250F
2005 Yamaha YZ125
2005 Yamaha YZ250F
2006 Yamaha WR250F
2006 Yamaha YZ125
2006 Yamaha YZ250F
2007 Yamaha WR250F
2007 Yamaha YZ125
2007 Yamaha YZ250F
2008 Yamaha WR250F
2008 Yamaha YZ125
2008 Yamaha YZ250F
2009 Yamaha WR250F
2009 Yamaha YZ125
2009 Yamaha YZ250F
2010 Yamaha WR250F
2010 Yamaha YZ125
2010 Yamaha YZ250F
2011 Yamaha WR250F
2011 Yamaha YZ125
2011 Yamaha YZ250F
2012 Yamaha WR250F
2012 Yamaha YZ125
2012 Yamaha YZ250F
2013 Yamaha WR250F
2013 Yamaha YZ125
2013 Yamaha YZ250F
2014 Yamaha WR250F
2014 Yamaha YZ125
2014 Yamaha YZ250F
2015 Yamaha WR250F
2015 Yamaha YZ125
2015 Yamaha YZ250F
2015 Yamaha YZ250FX
2016 Yamaha WR250F
2016 Yamaha YZ125
2016 Yamaha YZ250F
2016 Yamaha YZ250FX
2017 Yamaha WR250F
2017 Yamaha YZ125
2017 Yamaha YZ250F
2017 Yamaha YZ250FX
2018 Yamaha WR250F
2018 Yamaha YZ125
2018 Yamaha YZ250F
2018 Yamaha YZ250FX
2019 Yamaha WR250F
2019 Yamaha YZ125
2019 Yamaha YZ250F
2019 Yamaha YZ250FX
2020 Yamaha WR250F
2020 Yamaha YZ125
2020 Yamaha YZ125X
2020 Yamaha YZ250F
2020 Yamaha YZ250FX
2021 Yamaha WR250F
2021 Yamaha YZ125
2021 Yamaha YZ125X
2021 Yamaha YZ250F
2021 Yamaha YZ250FX
2022 Yamaha WR250F
2022 Yamaha YZ125
2022 Yamaha YZ125X
2022 Yamaha YZ250F
2022 Yamaha YZ250FX
2023 Yamaha WR250F
2023 Yamaha YZ125
2023 Yamaha YZ125X
2023 Yamaha YZ250F
2023 Yamaha YZ250FX
2024 Yamaha WR250F
2024 Yamaha YZ125
2024 Yamaha YZ125X
2024 Yamaha YZ250F
2024 Yamaha YZ250FX
2025 Yamaha WR250F
2025 Yamaha YZ125
2025 Yamaha YZ125X
2025 Yamaha YZ250F
2025 Yamaha YZ250FX
2026 Yamaha WR250F
2026 Yamaha YZ125
2026 Yamaha YZ125X
2026 Yamaha YZ250F
2026 Yamaha YZ250FX