High Quality Gokart Track Motorcycle Rear Sprocket Industrial Chain Sprocket Rear. Extended Lifespan: SFR Super O-Ring chain offers 150% lifespan compared to ordinary O-ring chains. High Strength Material: Made of Alloy Steel with 20.6 kN tensile strength for durable performance. Certified Quality: Certified by ISO9001:2001 and CE standards for reliable industrial use. Flexible Customization: Accepts OEM orders with customizable colors like Gold and specific sizes. Wide Compatibility: Available in 420, 428, 520, 525, 530 chain types for various motorcycles. Professional Support: Includes detailed installation guides and selection charts for safe usage. Trusted Manufacturer: SFR Chain is a top global manufacturer with over 70 patents and 13 years export experience. Strict Quality Control: 100% inspection of finished products including visual and function checks.