Shimano Tiagra ST-4703 triple chainring left-hand shifter - IST4703LI2

The Tiagra ST-4703-LShimano (part no. IST4703LI2) is a left-hand Dual Control (STI) lever designed for Tiagra 3x10-speed road drivetrains Shimano . It allows you to control the triple-chainring front derailleur whilst operating the front brake, all via a single ergonomic lever designed for comfort and precision.

Part of the Tiagra 4700 range, this shifter features Dual Control Lever technology, offering smoother chainring changes and a more progressive brake lever action. It is specially calibrated for compatible triple-chainring drivetrains Shimano, with optimised cable pull to ensure reliable and consistent gear changes.

Technical specifications

• Brand: Shimano
• Range: Tiagra 4703
• Part number: IST4703LI2
• Type: left-hand road Dual Control shifter
• Drivetrain: 3 chainrings (3x10-speed)
• Function: chainring shifting + front brake
• Compatibility: Shimano Tiagra 4700/4703 10-speed groupsets
• Mounting: clamp 23.8–24.2 mm
• Adjustment: reach adjust (lever reach adjustment)
• Technology: Dual Control Lever (DCL), SLR-EV
• Use: endurance road bike / training

Key features

• Integrated brake and front derailleur control
• Smooth and precise chainring shifting on triple set-ups
• Ergonomics Shimano s optimised for long rides
• Reach adjustment to suit all hand sizes
• Reliable compatibility with the Tiagra 4703 system
• Good balance between performance and affordability

FAQ

Is this shifter compatible with a Tiagra 2x10 groupset?

No, the ST-4703-L is specifically designed for 3x10 drivetrains (triple chainring).

Can it be used with a 105 or Sora front derailleur?

Not recommended: cable pull and compatibility are optimised for Tiagra 4703 components.

Is it compatible with disc brakes?

Yes, but only if the bike is fitted with road-compatible mechanical calipers (it is not hydraulic).

How does it differ from a Tiagra right-hand shifter?

The left shifter controls the front brake and the chainrings, whilst the right shifter controls only the rear cassette.

Can you replace just the left-hand shifter?

Yes, ‘ Shimano ’ allows each side to be replaced independently.