Vortex 313ZK-56 Aluminum Rear Sprocket 420 Pitch 56-Tooth

The Vortex 313ZK-56 is a high-performance aluminum rear sprocket engineered for 420 pitch chain applications. Featuring a 56-tooth configuration, this sprocket is precision CNC-machined from aerospace-grade 7075 T6 aluminum, delivering an ideal balance of strength and reduced rotating mass for improved throttle response and drivetrain efficiency.

Vortex's patented tooth geometry minimizes chain drag and extends sprocket life beyond what standard steel OEM units can offer. The anodized finish provides both corrosion resistance and a clean, race-inspired appearance.

Key Features:

• 420 Chain Pitch — must be used with a matching 420 pitch chain
• 56 Teeth — increases low-end torque and acceleration
• 7075 T6 Aluminum Construction — maximum strength with significant weight savings over steel
• CNC Machined — tight tolerances ensure concentricity and smooth power delivery
• Patented Tooth Design — reduces friction and extends chain and sprocket service life
• Anodized Finish — resists corrosion and adds visual appeal
• Lightening Holes — further reduce rotating mass for improved performance

The Vortex 313ZK-56 is an excellent upgrade over stock steel sprockets for riders seeking improved acceleration and a lightweight drivetrain on compatible 420-chain motorcycles and ATVs.