- Low Friction X-Ring? Chain
- Chromoly Steel Front Sprocket
- High Carbon Steel Rear Sprocket
- The X-Rings twist between the side plates instead of being squished to reduce friction and minimize power loss
- High carbon rear sprockets are heat treated for maximum durability and long life
- Countershaft sprockets are made from chromoly steel for superior strength and durability
Kawasaki -- EX250-F Ninja 250R -- (1999, 2007, 2001, 2004, 2005, 1992, 1994, 1988, 1995, 2003, 1990, 1996, 1989, 1993, 1991, 2000, 1997, 2002, 2006, 1998)