🔹 SPECIFICATIONS

• Brand: SunRace

• Part Type: Twist Shifter Set

• Model: TSM-37

• Shifter Style: Twist / Grip Shifters

• Speeds: 3x7 (21-Speed Drivetrain)

• Indexing Type: Indexed – 2:1 Actuation Ratio (Shimano Compatible)

• Color: Black

• Material: Reinforced Plastic Core with Rubberized Grip Surface

  • Soft rubber sleeves for secure grip and comfort

  • Strong polymer housing ensures durability and lightweight feel

• Left/Right/Pair: Pair (Includes Front & Rear Shifters)

• Sold As: Complete Set

• Cable & Housing:

  • Front Cable Length: 1700 mm

  • Rear Cable Length: 2100 mm

  • Includes inner stainless cables + outer black housing

  • Pre-lubricated for smooth performance

• Handlebar Clamp Size: Standard 7/8" (22.2 mm)

• Gear Display: Built-in optical gear indicators for both shifters

• Country/Region of Manufacture: Taiwan

🔹 DIMENSIONS

• Handlebar Fit: 22.2 mm (7/8”) diameter

• Grip Length: ~95–100 mm per shifter

• Cable Lengths:

  • Front: 1700 mm

  • Rear: 2100 mm

• Item Width: ~85 mm

• Item Height: ~40 mm

🔹 COMPATIBILITY

✅ Fully Compatible With:

• Shimano 7-Speed Rear Derailleurs (Tourney, Altus, Acera, Alivio, etc.)

• Shimano 3-Speed Front Derailleurs (MTB/Hybrid type)

• All Shimano SIS-indexed 21-speed drivetrains

• Standard 22.2 mm (7/8") MTB, Hybrid, and Comfort bike handlebars

✅ Cross-Compatible With:

• SunRace derailleurs that use Shimano 2:1 cable pull

• Standard 7-speed freewheels or cassettes

❌ Not Compatible With:

• SRAM 1:1 systems (MRX, Rocket, or Attack)

• MicroSHIFT 1:1 systems

• Drop-bar road setups

🔹 FEATURES & PERFORMANCE

• Precise Indexed Shifting:
  Each rotation produces crisp, defined clicks for accurate gear selection on both front and rear derailleurs.

• Ergonomic Grip Design:
  Soft rubberized grip sleeves ensure comfort and control, even when riding in wet conditions.

• Integrated Gear Indicators:
  Visual gear position display helps riders know exactly which gear they’re in — easy to read at a glance.

• Complete Cable Set Included:
  Comes pre-fitted with front and rear inner cables and outer casings, saving time and cost on installation.

• Reliable Construction:
  SunRace uses high-quality polymers and pre-lubed internal mechanisms to ensure smooth and long-lasting operation.

• Lightweight & Easy to Install:
  Designed to mount quickly on any standard MTB-style handlebar using a simple clamp design.

🔹 COLOR & FINISH

• Primary Color: Matte Black

• Accent: White numbering with red indicators

🔹 IDEAL FOR

• Mountain Bikes (MTB)

• Hybrid / Trekking Bikes

• Comfort & City Bikes

• 21-Speed Recreational or Commuter Bicycles

• Replacement for Shimano RevoShift SL-RS35, SL-RS25, or similar units

🔹 PACKAGING CONTENTS

• 1 × Left 3-Speed Twist Shifter

• 1 × Right 7-Speed Twist Shifter

• 2 × Stainless Steel Inner Cables (1700 mm / 2100 mm)

• 2 × Black Outer Casings

• SunRace packaging (bag, depending on supplier batch)