Renthal 5240-520-50GPBK Twinring Rear Sprocket 520 Chain 50 Tooth Black

The Renthal 5240-520-50GPBK Twinring Rear Sprocket is a premium 50-tooth, 520-pitch rear chainwheel engineered for off-road and motocross riders who demand the ultimate balance of low weight and maximum durability. Built on over 50 years of Renthal sprocket manufacturing expertise, the Twinring is the result of a 5-year development program carried out alongside top factory off-road and enduro race teams.

Dual-Material Twinring Design:

• Inner ring: High-strength Ultralight 7075-T6 aluminum alloy — the same material used in Renthal's legendary all-aluminum sprockets — keeps unsprung weight to an absolute minimum
• Outer ring: Electroless nickel-plated steel provides hardwearing durability exactly where the chain contacts the sprocket
• The outer ring is heated to 200°C before being permanently press-fitted to the inner aluminum ring, creating an interference bond that lasts for the life of the sprocket
• Flat socket head screws add further strength and prevent contact with the chain guide during side impacts

Key Features:

• Outlasts a standard all-aluminum sprocket by approximately 3 times, yet significantly lighter than an all-steel sprocket
• Precision CNC-machined to extremely tight tolerances for perfect concentricity, accurate tooth profile, and optimal load dispersion
• Self-cleaning mud grooves between every tooth on both sides prevent dirt and mud buildup, reducing wear and maintaining consistent power transfer
• Unique flat face design keeps weight to a minimum and makes the Twinring as narrow as a conventional chainwheel — no chain guide modifications required
• Black anodized finish applied through a 15-step individual process provides corrosion resistance and a clean, professional appearance
• Compatible with standard 520 chain pitch
• 50 tooth count for optimized gear ratio tuning

The Renthal Twinring is the preferred rear sprocket of more factory motocross and supercross teams than any other brand, delivering proven performance across all terrain types without compromising power delivery or adding unnecessary unsprung weight.