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Shimano Ultegra ST R8170 BR R8170 Di2 Left Front Shifter Brake Lever 2x12 Speed w Brake Caliper model dreadnoughtxt Rocky Mountain Thunderbolt Carbon 70 Rocky Mountain Thunderbolt Carbon 70 Mountain Bike 2020 Roval Alpinist SLX Disc Alloy Tubeless 700c Front Wheel Ultegra ST R8170 brake levers bring enhanced modulation and control to every ride by employing Shimano's proven SERVO WAVE technology the system is quieter than ever and easier to maintain
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