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18mm front/ 18mm rear pistons
this design doesn’t just make shifting faster—it reduces shift force and eliminates ghost shifting
and will not fit over 30mm spindles
Easy to use chain wear checker tool
Specialized REV4 Road Derailleur Hanger Colour:Black 18mm front/ 18mm rear pistonsGenuine replacement part from Specialized. Includes Mounting Hardware Compatible with the following models: 2012 2013 S Works Amira SL4 2012 2013 Amira Pro SL4 2014 Crux (all models) 2013 S Works Crux 2013 Crux 2013 2014 S Works Roubaix SL4 2011 2012 S Works Roubaix SL3 2011 2014 Roubaix Pro Expert Comp Elite 2011 Roubaix 2013 2014 S Works Ruby Pro Comp Elite 2013 Ruby Pro Expert Comp Elite 2012 2014 Shiv 2012 2014 S Works Tarmac SL4 2010 2011 S Works