Shimano 105 Di2 12v Disc ST-R7170L - ISTR7170LE left-hand front road bike brake lever

The Shimano 105 Di2 ST-R7170L left-hand shifter is an electronic gear-shifting control designed for road bikes fitted with the Shimano 105 Di2 12-speed groupset and hydraulic disc brakes.

Part number ISTR7170LE, this left-hand shifter controls the front derailleur of a Shimano 105 Di2 2x12-speed drivetrain. It incorporates the ergonomic design developed by Shimano to provide a comfortable grip and fast, precise gear changes.

Thanks to the wireless Di2 technology between the shifters and the rear derailleur, the ST-R7170L helps to simplify the handlebar setup and reduce the number of cables required on the handlebars. The shifter communicates electronically with the Di2 system to trigger gear changes.

Key features of the Shimano -105 Di2 ST-R7170L

• Genuine Shimano 105 Di2 left-hand shifter.
• Compatible with Shimano Di2 12-speed electronic drivetrains.
• Designed for road bikes fitted with hydraulic disc brakes.
• Part number ST-R7170L / ISTR7170LE.
• Electronic front derailleur control.
• Wireless transmission of commands to the rear derailleur.
• Shimano 105 ergonomics suited to long road rides.
• Shape designed to facilitate access to the controls from different hand positions.
• Operates using the button cell battery built into the grip.
• Ideal solution for replacing a damaged or faulty left-hand grip.

A Di2 shifter designed for road bikes

The Shimano 105 Di2 ST-R7170L operates on the same principle as the 12-speed generation of Di2 electronic shifters. A simple press of the button allows you to change gears, without the mechanical effort required by a traditional cable-operated shifter.

The left-hand shifter primarily controls the shift between the small and large chainrings. Combined with the right-hand shifter and the Di2 rear derailleur, it enables you to enjoy a fully electronic 2x12-speed drivetrain.

This technology offers particularly precise and consistent operation, especially when the bike is used in demanding conditions or when gear changes are frequent.

Ergonomics tailored for road cycling

The shape of the lever has been designed to provide a comfortable grip over long distances. The positioning of the buttons allows you to change gears whilst maintaining a stable position on the handlebars.

The ST-R7170L is designed for hydraulic disc braking systems Shimano. It therefore combines the Di2 electronic control unit and the front brake’s hydraulic master cylinder in a single unit.

This design keeps the handlebar area tidy and is particularly well-suited to modern road bikes.

Replacement for a left-hand Shimano 105 Di2 lever

The ST-R7170L is a replacement part for when the original left-hand shifter has been damaged following a fall, an accident or significant wear and tear.

It can also be used when refurbishing or repairing a bike fitted with a 105 Di2 R7150 groupset.

Please note: it is essential to check the exact part number of the shifter before ordering. The ST-R7170L version is for the left-hand side and must not be confused with the right-hand shifter, the ST-R7170R.

Expert tip: before ordering, check three things: left-hand side, 12-speed Di2 drivetrain and hydraulic disc brakes. Part number ST-R7170L is a specific shifter; it is not interchangeable with a mechanical 105 shifter or with a Di2 shifter from another generation.

After installation, please also remember to check that the shifter is paired with and functioning correctly with the Di2 system.

Technical specifications

• Brand: Shimano
• Range: 105
• Type: control unit / brake and gear lever
• Model number: ST-R7170L
• Product reference: ISTR7170LE
• Side: left
• Gear system: Di2 12-speed
• Drivetrain type: electronic
• Braking: hydraulic disc brake
• Position: road bike handlebars
• Main control: front derailleur
• Di2 communication: wireless with the rear derailleur
• Matching groupset: Shimano 105 Di2 R7150
• Use: road bike
• Technology: Shimano Di2
• Part: replacement / spare part