RK 520XSO2 features RX-Rings that have X shaped seals which provide a double barrier to seal lubrication, providing 2 times longer wear life than standard O-Ring chains. Upgraded from the RK 520XSO, the new RK 520XSO2 is refined to fit a wider range of street or off-road applications up to 800cc. Tensile Strength: 35.5 kN Weight: 15.6 grams per link Max CC Rating: 800cc Street / 800cc Dirt Master Link Type: Clip / Rivet Chain Length: 112 Fits: Honda CRF300L 2022 Husqvarna FE250 2016-2022 TC510 1990-1991 TC570 2001-2003 TC610 1998-2001 TE E610 DUAL SPORT 1998-2010 TE350 1990-1995 TE510 1990-1991 TE570 2001-2004 TE610 1991-2001 TR650 STRADA ABS 2015 TR650 TERRA 2015 KTM 620 LC4 SC SUPER COMPETITION 1999 Kawasaki EN650 VULCAN S 2015-2021 EN650 VULCAN S ABS L 2016 EN650 VULCAN S CAFE 2019-2021 EN650 VULCAN S SE 2019-2021 KDX420 1981