Conventional Street kit with laser-cut steel rear sprocketGearing one down in front, two up in rear Yamaha -- YZF-R1 -- (2010, 2012, 2011, 2013, 2014, 2009)
Low Friction X-Ring? ChainChromoly Steel Front SprocketHigh Carbon Steel Rear SprocketThe X-Rings twist between the side plates instead of being squished to reduce friction and minimize power...