The Tektro RX 4.0 Reverse Lever works with caliper or cantilever brakes and include external cable routing. Requires mountain end brake cable.Compatible with caliper or cantilever brakesFor use with 19.6 - 20.6 mm I.D. aero barsRequires mountain end brake cableExpanding plug clamp styleReturn spring and reach adjustmentForged aluminum lever and cast aluminum bracketItem SpecificationsCable Head TypeMountainBrake Lever ActuationShort PullWeight166Brake Lever UseLeftBrake Lever UseRight