Renthal 5240-520-51GPBK TwinRing Rear Sprocket 520 Chain 51T Black

The Renthal 5240-520-51GPBK TwinRing Rear Sprocket is Renthal's premium dual-material rear chainwheel, engineered for off-road, enduro, and dual-sport riders who demand long-lasting performance without sacrificing lightweight handling. Featuring a 520 chain pitch and 51-tooth count, this sprocket is finished in an aggressive black anodized coating.

TwinRing Dual-Material Construction:

• Hardened steel outer chain ring thermally bonded to an Ultralight aluminum inner ring — the outer ring is expanded to 200°C before being permanently fitted to the inner, creating a bond that lasts the life of the sprocket
• Flat socket set screws prevent lateral movement between rings under high-velocity impacts
• Steel outer ring delivers the long wear life of a steel sprocket while the aluminum inner ring keeps unsprung weight to a minimum

Key Features:

• Chain Pitch: 520
• Tooth Count: 51T
• Finish: Black anodized
• Inner Ring Material: Ultralight 7075 T-6 aluminum alloy
• Outer Ring Material: Hardened steel, electro-less nickel coated
• Hard anodized surface finish provides an integral coating that resists corrosion — applied in a meticulous 15-step individual process
• Precision CNC machined to extremely tight tolerances for accurate fit, tooth profile, and concentricity
• Self-cleaning mud grooves between every tooth on both sides to prevent dirt buildup
• Available in 6 colors: black, blue, red, green, orange, and titanium

Backed by over 50 years of motocross rear sprocket manufacturing expertise, the Renthal TwinRing is the choice of top factory off-road and enduro race teams worldwide. The 5240-520-51GPBK is the ideal upgrade for riders seeking steel-level durability with the weight savings of aluminum.