{"product_id":"renthal-ren437u-520-40gbsi-ultralight-rear-grooved-sprocket","title":"Renthal - ren437U-520-40GBSI - UltraLight Rear Grooved Sprocket","description":"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.\n\u003cp\u003eThe Renthal UltraLight Rear Grooved Sprocket is a CNC-machined rear chainwheel made from 7075 T6 aluminum. Its lightweight construction is engineered for powersports applications while maintaining the strength and precision required for effective drivetrain performance.\u003c\/p\u003e\u003cp\u003eComputer engineering and testing support precise fitment, concentricity, and load dispersion. The tooth profile is designed to promote maximum power transfer, while the hardwearing surface treatment helps support long-term use. This sprocket features a 520 chain size and 40 teeth with a silver finish.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features \u0026amp; Performance Benefits\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e7075 T6 Aluminum Construction:\u003c\/strong\u003e CNC machined from high-strength aluminum for a lightweight rear sprocket design.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUltraLight Design:\u003c\/strong\u003e Renthal states that the sprocket is 66% lighter than steel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision Engineering:\u003c\/strong\u003e Computer engineered and tested to support accurate fitment, concentricity, and load dispersion.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTooth Profiling and Surface Treatment:\u003c\/strong\u003e Designed for maximum power transfer with a hardwearing treated surface.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eKey Product Specifications \u0026amp; Technical Data\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Renthal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e ren437U-520-40GBSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e UltraLight rear chainwheel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e 7075 T6 aluminum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturing Method:\u003c\/strong\u003e CNC machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChain Size:\u003c\/strong\u003e 520\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTooth Count:\u003c\/strong\u003e 40\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Silver\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eWhat's Included in the Box\u003c\/strong\u003e\u003cbr\u003eOne Renthal UltraLight rear grooved sprocket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e\u003cbr\u003eFits 2004–2009 Yamaha YFZ450, 2010–2011 Yamaha YFZ450X, 2011 Yamaha YFM250R Raptor, and 2012 Yamaha YFZ450.\u003c\/p\u003e\u003cbr\u003e\nFitments:\u003cbr\u003e\n2004 Yamaha YFZ450 Base\u003cbr\u003e\n2005 Yamaha YFZ450 Base\u003cbr\u003e\n2006 Yamaha YFM700R Raptor Base\u003cbr\u003e\n2006 Yamaha YFZ450 Base\u003cbr\u003e\n2007 Yamaha YFM700R Raptor Base\u003cbr\u003e\n2007 Yamaha YFZ450 Base\u003cbr\u003e\n2008 Yamaha YFM700R Raptor Base\u003cbr\u003e\n2008 Yamaha YFZ450 Base\u003cbr\u003e\n2009 Yamaha YFM700R Raptor Base\u003cbr\u003e\n2009 Yamaha YFZ450 Base\u003cbr\u003e\n2010 Yamaha YFM700R Raptor Base\u003cbr\u003e\n2010 Yamaha YFZ450 Base\u003cbr\u003e\n2010 Yamaha YFZ450X Base\u003cbr\u003e\n2011 Yamaha YFM250R Raptor Base\u003cbr\u003e\n2011 Yamaha YFM700R Raptor Base\u003cbr\u003e\n2011 Yamaha YFZ450 Base\u003cbr\u003e\n2011 Yamaha YFZ450X Base\u003cbr\u003e\n2012 Yamaha YFM700R Raptor Base\u003cbr\u003e\n2012 Yamaha YFZ450 Base\u003cbr\u003e\n2013 Yamaha YFM700R Raptor Base\u003cbr\u003e\n2013 Yamaha YFZ450 Base\u003cbr\u003e\n2014 Yamaha YFM700R Raptor Base\u003cbr\u003e\n2015 Yamaha YFM700R Raptor Base\u003cbr\u003e\n2016 Yamaha YFM700R Raptor Base\u003cbr\u003e\n2017 Yamaha YFM700R Raptor Base\u003cbr\u003e\n2018 Yamaha YFM700R Raptor Base\u003cbr\u003e\n2019 Yamaha YFM700R Raptor Base\u003cstyle\u003etable.productattributes, .productattributes td { border-bottom: 1px solid #ddd; 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