Bontrager Aeolus RSL handlebar/stem unit An integrated handlebar/stem combination that neatly and securely accommodates cables for a cleaner look and optimized aerodynamics. Save watts and ride faster This aero upgrade cleans up your cockpit by optimally routing all cables for a cleaner look and better aerodynamics. The Aeolus RSL handlebar/stem unit has been proven to save 7 watts in the wind tunnel, making it 10% faster than its predecessor. It's light, fast, easy to fit and also compatible with Blendr to seamlessly integrate your lights or Garmin computer. Product details The OCLV carbon construction is ultra-light, compliant and durable The integrated handlebar-stem combination improves aerodynamics and saves weight Saves 7 watts proven in the wind tunnel, making it 10 % faster than its predecessor Secure attachment of integrated cable routing system using M4 hexagon socket screw (5 Nm tightening torque) Variable Radius Compact (VR-C) for a longer reach and larger drop Approved for carbon or aluminum steerer tubes Weight (manufacturer's specification): 292 g. Original part number: 5309263