Renthal 520-37 Teeth 437U-520-37GBSI Rear Chainwheel

Renthal UltraLight Rear Chainwheels are CNC machined from 7075 T6 aluminum to extremely tight tolerances, 66% lighter than steel. Computer engineered and tested to ensure a precise fitment, concentricity and load dispersion with tooth profiling to provide maximum power transfer. A combination of high strength base material, cutting edge manufacturing methods and exceptional hardwearing surface treatments its clear to see why Renthal's light weight all aluminum rear sprockets can be found on the rear wheels of many factory race team machines.

The Renthal 437U-520-37GBSI UltraLight Rear Chainwheel is a CNC-machined aluminum rear sprocket designed for precise fitment and efficient power transfer. It is engineered from 7075 T6 aluminum and is 66% lighter than steel, helping reduce sprocket weight while maintaining a high-strength base material.

Computer engineering and testing support accurate fitment, concentricity, and load dispersion. The tooth profile is designed to provide maximum power transfer, while the hardwearing surface treatment supports durability in powersports applications. This silver, 520-size rear sprocket has 37 teeth and features a grooved design.

Fitment includes 2004–2009 Yamaha YFZ450, 2010–2011 Yamaha YFZ450X, 2011 Yamaha YFM250R Raptor, and 2012 Yamaha YFZ450 models. Manufacturer part number: 437U-520-37GBSI. Vendor part number: 437U-520-37GBSI.

Features:

• Brand: Renthal
• Product type: UltraLight rear chainwheel
• Material: CNC-machined 7075 T6 aluminum
• Weight advantage: 66% lighter than steel
• Sprocket specification: 520 chain size with 37 teeth
• Design: Grooved silver rear sprocket
• Engineering: Computer engineered and tested for precise fitment, concentricity, and load dispersion
• Tooth profile: Designed to provide maximum power transfer
• Fitment: 2004–2009 Yamaha YFZ450; 2010–2011 Yamaha YFZ450X; 2011 Yamaha YFM250R Raptor; 2012 Yamaha YFZ450
• Manufacturer part number: 437U-520-37GBSI
• Vendor part number: 437U-520-37GBSI

Air Freight Prohibited: false
Not Carb Approved: false
Ltl Freight Required: false
Prop 65: Unknown
Part Type: powersports
Epa: N/A
Carb Acknowledgement Required: false
Regular Stock: t
Units Per Sku: 1
Fitment:
2004 Yamaha YFZ450 Base
2005 Yamaha YFZ450 Base
2006 Yamaha YFM700R Raptor Base
2006 Yamaha YFZ450 Base
2007 Yamaha YFM700R Raptor Base
2007 Yamaha YFZ450 Base
2008 Yamaha YFM700R Raptor Base
2008 Yamaha YFZ450 Base
2009 Yamaha YFM700R Raptor Base
2009 Yamaha YFZ450 Base
2010 Yamaha YFM700R Raptor Base
2010 Yamaha YFZ450 Base
2010 Yamaha YFZ450X Base
2011 Yamaha YFM250R Raptor Base
2011 Yamaha YFM700R Raptor Base
2011 Yamaha YFZ450 Base
2011 Yamaha YFZ450X Base
2012 Yamaha YFM700R Raptor Base
2012 Yamaha YFZ450 Base
2013 Yamaha YFM700R Raptor Base
2013 Yamaha YFZ450 Base
2014 Yamaha YFM700R Raptor Base
2015 Yamaha YFM700R Raptor Base
2016 Yamaha YFM700R Raptor Base
2017 Yamaha YFM700R Raptor Base
2018 Yamaha YFM700R Raptor Base
2019 Yamaha YFM700R Raptor Base