Hayes cx pro disc brake 160mm rotorin 2014 in an effort to meet the increasing demand for drop bar specific disc brakes and accommodate a wider price range of bicycles we have extended our mechanical brake lineup each will offer best in class performance at their given price with a lighter weight and premium hardware the cxpro is our elite offering featuresone piece forged aluminum calipernew machined window and bridge section for reduced weight and ventilationnew reduced weight ball ramp