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and Presta valves are common on higher-spec fat builds where precision pressure adjustment matters
consistent training surface even during explosive efforts
delivering maximum responsiveness
which adds positioning flexibility and makes it easier to fit on smaller frames
Shimano R8170 Ultegra Di2 Shifter and Brake - Left Dropper Lever and Presta valves are commonWhat Does the Shimano Ultegra R8170 Di2 Left Lever Control? The Shimano ST R8170 left lever is the front brake and front derailleur shift control for the 12 speed Ultegra Di2 hydraulic disc brake system, combining wireless electronic shifting with SERVO WAVE hydraulic braking in a single ergonomically refined lever body. Wireless Di2 connectivity eliminates the shift cable entirely between lever and front derailleur, sending commands via Bluetooth LE
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