Get long-lasting drive performance without the weight penalty. The JT Sprockets Twinstar Steel/Aluminum Hybrid Rear Sprocket is designed to deliver reliable power transfer with a durable steel tooth ring and a lightweight aviation-grade 7075-T6 (ergal) aluminum core. It’s an ideal upgrade when you want race-ready weight savings but need the wear resistance of steel.
By combining materials, this sprocket helps reduce wear compared to standard aluminum options while keeping rotating mass low—great for consistent acceleration, improved drivetrain efficiency, and fewer replacements over time.
Key features:
✅ Steel outer ring – durable tooth surface for extended life
✅ Heat-induction hardened high-carbon steel – built for harsh conditions and strong wear resistance
✅ 7075-T6 aluminum (ergal) core – lightweight, high-strength construction
Benefits of use:
🔹 Longer service life than typical aluminum sprockets, reducing maintenance frequency
🔹 Lightweight performance thanks to the aluminum core for responsive acceleration
🔹 Precise fit and power transfer from state-of-the-art laser cutting and CNC machining
Technical specifications:
📌 Brand: JT Sprockets
📌 Model/Style: Twinstar
📌 Position: Rear
📌 Chain size: 520
📌 Tooth count: 50T
📌 Materials: 7075-T6 Aluminum + Carbon Steel
📌 Color/Finish: Black/Gold
📌 Vendor part number: JTX251.50GLD
Why choose this product?
⭐ Hybrid construction balances low weight and high durability
⭐ Built with JT’s advanced hardening/tempering processes for reliable wear resistance
⭐ Precision manufacturing delivers a race-focused, high-quality upgrade
