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.
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
Handlebar Fit: 22.2 mm (7/8”)
Lever Length: 120 mm
Item Width (each): 90 mm
Item Height (each): 45 mm
✅ 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
✅ 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.
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
Mountain Bikes (MTB)
Hybrid / Trekking Bicycles
City / Comfort Bikes
3×8 (24-Speed) Drivetrains
V-Brake and Linear Pull Braking Systems
1 × Left 3-Speed Trigger Shifter with Integrated Brake Lever
1 × Right 8-Speed Trigger Shifter with Integrated Brake Lever