MSR 520 41Hundred Series Rear Sprocket

520 41Hundred Series Rear Sprocket

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MSR Racing 520 41Hundred Series Rear Sprocket

The MSR 41Hundred Series Sprocket is the hardest, longest lasting sprocket in the world today. Made of 4100 series chromoly which is a blend of
chromium and molybdenum along with manganese and nickel. It is extremely tough and wear resistant. Added to that they are heat treated to add extra hardness to the metal, through and through, not just on the surface, using the quench & tempered method. This is the same process used on the highest quality tools.

A quality rear sprocket needs the best materials but it also needs the best manufacturing processes. The 41Hundred is cut by a Mazak Fiber Laser to a much finer degree of precision than most other cutting methods. The teeth themselves are shaped into a special double “U” shape that allows the chain to roll easier on and off for maximum horsepower transmission. Lastly the sprocket is nickel/chrome plated to help prevent corrosion and then laser etched.

In the past you had to choose between a sprocket that was long lasting or lightweight. The 41Hundred is made from such a tough material that we can cut away far more excess material than other steel sprockets making it the lightest chromoly sprocket in the world. How light? A modern motocross bike’s rear wheel weighs just 2% more with our 41Hundred sprocket on it compared to having the lightest aluminum sprocket attached. And that aluminum sprocket wears out 3 to 4 times faster than our 41Hundred chromoly sprocket.

  • One year guarantee against excessive wear
  • Lightest chromoly sprocket
  • Lasts 3 to 4 times longer than aluminum
  • Made in USA
  • Precision laser cut
  • 250,000 PSI tensile strength vs 90,000 in 7075 alum.
  • Average 50 tooth sprocket weighs just 1.3 pounds (590 grams)
  • Item # 21295
  • SKU #
  • Mfr. Part #

FitmentView All

Honda Models

  • CR125R : 1983–2007
  • CR250R : 1984–2007
  • CR500R : 1986–2001
  • CRF150F : 2003–2009, 2012
  • CRF230F : 2005–2009, 2012
  • CRF250R : 2004–2015
  • CRF250X : 2004–2009, 2012–2013, 2015
  • CRF450R : 2002–2015
  • CRF450X : 2005–2010, 2012–2015
  • XR200R : 1985, 1987, 1990, 1994, 2000, 2002
  • XR250R : 1986–2004
  • XR400R : 1996–2004
  • XR650R : 2000–2007

Husaberg Models

  • FE 390 : 2010–2011
  • TE 250 : 2012–2014
  • TE 300 : 2012–2014

Husqvarna Models

  • FC 250 : 2014–2015
  • FC 450 : 2014
  • FE 250 : 2014
  • FE 350 : 2015
  • FE 501 : 2014
  • TC 125 : 2014
  • TC250 : 2014
  • TE 250 : 2014–2015
  • TE 300 : 2014–2015

Kawasaki Models

  • KDX200 : 1984–2006
  • KDX220 : 1997–2005
  • KDX250 : 1991–1994
  • KLR650 : 1987–2015
  • KLX250R : 1994–1996
  • KLX250S : 2006–2007, 2009–2010
  • KLX300 : 1997, 2005
  • KLX300R : 2005–2007
  • KLX400 : 2003
  • KLX400S : 2003
  • KLX450R : 2008–2009
  • KLX650R : 1993–1996
  • KX125 : 1986–2005
  • KX250 : 1986–2007
  • KX250F : 2004–2016
  • KX450F : 2006–2015
  • KX500 : 1986–2004

KTM Models

  • 125 EXC : 1991–2007
  • 125 MX : 1991
  • 125 SX : 1992–2009, 2011–2015
  • 144 SX : 2007–2008
  • 150 SX : 2009–2015
  • 150 XC : 2010–2012, 2014
  • 200 EXC : 1998–2005, 2010–2011
  • 200 MXC : 1998–2003
  • 200 SX : 1998–2004
  • 200 XC : 2006–2009
  • 200 XC-W : 2006–2015
  • 250 DXC : 1991–1992
  • 250 EXC : 1991–2005, 2010–2011
  • 250 MX : 1990–1991
  • 250 MXC : 1998–2001
  • 250 SX : 1992–2015
  • 250 SX-F : 2005–2015
  • 250 TXC : 1992
  • 250 XC : 2006–2016
  • 250 XC-F : 2008–2009, 2011–2015
  • 250 XCF-W : 2007–2010, 2014
  • 250 XCF-W Six Days : 2011
  • 250 XC-W : 2006–2011, 2014
  • 300 EXC : 1990–2006, 2010–2011
  • 300 MX : 1991–1992
  • 300 MXC : 1993–2005
  • 300 SX : 1992
  • 300 TXC : 1991–1992
  • 300 XC : 2006–2016
  • 300 XC-W : 2006–2015
  • 350 EXC : 1990
  • 350 EXC-F : 2012–2015
  • 350 SX-F : 2011–2015
  • 350 XC-F : 2011–2015
  • 350 XCF-W : 2014
  • 360 EXC : 1996–1997
  • 360 MXC : 1996–1997
  • 360 SX : 1996–1997
  • 380 EXC : 1998–2002
  • 380 MXC : 1998–2001
  • 380 SX : 1998–2002
  • 400 EXC : 1996, 2000–2002, 2004–2006, 2010–2011
  • 400 EXC-G Racing : 2007
  • 400 LC4 : 1993–1995, 1997–1998, 2000
  • 400 MXC : 2001–2002
  • 400 RXC : 1996–1998
  • 400 SX : 1998, 2000–2002
  • 400 XC-W : 2009–2010
  • 440 EXC : 1994–1995
  • 440 MXC : 1994–1995
  • 450 EXC : 2003–2011
  • 450 EXC-G Racing : 2007
  • 450 MXC : 2003–2005
  • 450 SMC : 2004
  • 450 SMR : 2004–2006
  • 450 SX : 2003–2007
  • 450 SX-F : 2008–2015
  • 450 XC : 2007
  • 450 XC-F : 2008–2009, 2014
  • 450 XC-G Racing : 2007
  • 450 XC-W : 2012–2015
  • 450 XC-W Racing : 2008–2009
  • 450SX : 2009, 2011–2012
  • 500 EXC : 2012–2015
  • 500 MX : 1991
  • 500 SX : 1992
  • 500 XC-W : 2012–2014
  • 505 SX-F : 2007–2008
  • 505 XC-F : 2008–2009
  • 520 EXC : 2000–2002
  • 520 MXC : 2001–2002
  • 520 SX : 2000–2002
  • 525 EXC : 2003–2007
  • 525 EXC-G Racing : 2007
  • 525 MXC : 2003–2005
  • 525 SMC : 2004
  • 525 SMR : 2004–2005
  • 525 SX : 2003–2006
  • 525 SX Racing : 2005
  • 525 XC : 2006–2007
  • 525 XC-G Racing : 2007
  • 530 EXC : 2009–2011
  • 530 EXC-R : 2008
  • 530 XC-W Racing : 2008–2009
  • 550 DXC : 1992
  • 550 MXC : 1993–1996
  • 600 LC4 : 1991–1993
  • 600 MX : 1990
  • 620 Duke : 1997
  • 620 LC4 : 1997–1998
  • 660 SMC : 2004
  • 690 Supermoto : 2007–2008

Suzuki Models

  • DR350 : 1990–1996, 1998
  • DR350S : 1990–1993
  • DR350SE : 1994–1999
  • DR-Z250 : 2001–2007
  • DR-Z400 : 2000–2007
  • DR-Z400E : 2000–2007
  • DR-Z400S : 2000–2009, 2011–2014
  • DR-Z400SM : 2005–2009, 2013–2014
  • RM125 : 1986–2007
  • RM250 : 1986–2008
  • RMX250 : 1989–1998
  • RMX450Z : 2010
  • RM-Z250 : 2004–2015
  • RM-Z450 : 2005–2015

Yamaha Models

  • WR250F : 2001–2009, 2011–2013, 2015
  • WR400F : 1999–2000
  • WR426F : 2001–2002
  • WR450F : 2003–2009, 2011–2014
  • YZ125 : 1988–2015
  • YZ250 : 1999–2015
  • YZ250F : 2001–2015
  • YZ400F : 1998–1999
  • YZ426F : 2000–2002
  • YZ450F : 2003–2015

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