DID Motocross Chain - Made in Japan Don't settle for anything less. Used by Ryan Villopoto to win 4 AMA SX titles All D.I.D 'ER' chains are designed exclusively for racing. 520ERT3 is used by the top factory SX and MX Teams to win races. 520MX chain has higher tensile strength for maximum performance and is ideal for muddy and sandy conditions. 520VT2 for offroad applications where a sealed chain is preferred, D.I.D's 520VT2 X-Ring chain provides excellent low friction high performance. D.I.D's exclusive SDH pin treatment is featured on the 520ERT2, 520 MX, 520DZ and all NZ Series chains. Fits: BETA RR250 2T 2013-2019 RR250 Racing 2T 2017-2019 Honda CR125R 2004-2007 CRF250R 2011-2020 CRF250RX 2019-2021 CRF250X 2004 2006-2010 CRF450R 2009-2016 CRF450X 2008 Husqvarna TE250 2005-2009 Yamaha YZ125 2008-2009 YZ250 1990-1993 YZ450F 2019-2021