SunRace STM-503 3x8 Speed Trigger Shifter Set with V-Brake Levers – Black – Shimano Compatible 22.2 mm Clamp (Pair).

The SunRace STM-503 3x8 Speed V-Brake Trigger Shifter Set combines precise Shimano-compatible shifting with powerful braking performance in one reliable, ergonomic design.

Engineered for Shimano SIS 2:1 actuation systems, this dual-control set provides smooth, indexed gear changes for 3x8-speed drivetrains (24-speed total) while maintaining excellent braking control through its integrated alloy V-brake levers.

Perfect for mountain, hybrid, or trekking bikes, the STM-503 is a great upgrade or replacement for Shimano EF-series units such as ST-EF500 or ST-EF51, offering dependable performance and long-term durability.

🔹 SPECIFICATIONS

• Brand: SunRace

• Part Type: Integrated Trigger Shifter & V-Brake Lever Set (Right & Left Pair)

• Model: STM-503

• Shifter Style: Trigger / Integrated Brake Lever Combo

• Speeds: 3x8 (24-Speed Total)

• Compatibility: Shimano SIS 2:1 Actuation Systems

• Brake Type: V-Brake / Linear Pull Compatible

• Color: Black

• Material:

  • Reinforced composite body

  • Alloy brake lever arms

  • Hardened steel internal indexing system

• Left/Right/Pair: Pair (Left + Right)

• Sold As: Set (Both Levers)

• Clamp Size: 22.2 mm (7/8”) – standard flat/riser handlebar fit

• Cable Type: Compatible with standard brake and shift cables

• Country/Region of Manufacture: Taiwan

🔹 DIMENSIONS

• Handlebar Fit: 22.2 mm (7/8”)

• Lever Length: 120 mm

• Item Width (each): 90 mm

• Item Height (each): 45 mm

🔹 COMPATIBILITY

✅ Fully Compatible With:

• Shimano 3x8 (24-speed) drivetrain systems (Tourney TX, Altus, Acera, Alivio)

• Shimano SIS 2:1 front and rear derailleurs

• SunRace derailleurs using Shimano-style actuation

• V-brake and linear-pull brake systems

• Standard 22.2 mm flat or riser handlebars

❌ Not Compatible With:

• Hydraulic braking systems

• Drop-bar or cantilever brakes

• SRAM 1:1 actuation systems

🔹 FEATURES & PERFORMANCE

• ✅ Complete 3x8 Speed Set:
  Includes left 3-speed and right 8-speed trigger shifters with integrated alloy V-brake levers.

• Shimano-Compatible 2:1 Indexing:
  Ensures smooth, accurate shifting performance for all 24 gears.

• Dual Trigger Design:
  Separate thumb and index triggers allow for precise, responsive upshifts and downshifts.

• Alloy Brake Levers:
  Lightweight and strong, offering smooth and controlled braking action.

• Optical Gear Displays:
  Easy-to-read gear indicators on both shifters show current gear selection at a glance.

• Durable Construction:
  Reinforced polymer body with steel internals for long service life.

• Ergonomic Lever Shape:
  Comfortable grip and natural finger positioning for improved control and reduced hand fatigue.

• Easy Installation:
  Fits standard 22.2 mm handlebars and uses standard cable routing — plug-and-play for Shimano-style drivetrains.

🔹 COLOR & FINISH

• Primary Color: Matte Black

• Finish: Textured composite housing with brushed alloy lever arms

• Gear Display: Transparent lens with 1–3 (front) and 1–8 (rear) numbering

🔹 IDEAL FOR

• Mountain Bikes (MTB)

• Hybrid / Trekking Bicycles

• City / Comfort Bikes

• 3×8 (24-Speed) Drivetrains

• V-Brake and Linear Pull Braking Systems

🔹 PACKAGING CONTENTS

• 1 × Left 3-Speed Trigger Shifter with Integrated Brake Lever

• 1 × Right 8-Speed Trigger Shifter with Integrated Brake Lever