Upgrade your gravel and mixed-terrain rides with the GRX FC-RX610-1 Crankset - a high-performance, lightweight, and durable component engineered for versatility and efficiency. Crafted from materials, this 165mm crank features a sleek black finish and 's advanced Hollowtech II spindle interface, ensuring optimal strength and stiffness while reducing weight for enhanced riding agility. Designed specifically for gravel, cyclocross, and adventure riding, the FC-RX610-1 offers a single 40-tooth chainring with an 110 BCD (Bolt Circle Diameter), providing a perfect balance of speed and control across varied terrain. Its innovative 12-speed gearing system delivers precise, seamless shifts and compatibility with HG 12-speed chains, enabling riders to customize their gear range with options like 10-45t or 10-51t cassettes (sold separately). Performance & Engineering features include a 49.7mm chainline optimized for mixed-terrain setups, a 151mm Q-factor for comfortable pedaling stance, and compatibility with 135/142mm road disc hubs tailored for wider 415mm chainstays-ideal for modern gravel and adventure bikes. Whether you're tackling steep climbs or fast descents, this crankset's combination of lightweight design, advanced components, and versatile gearing makes it the perfect choice for serious gravel riders and adventure cyclists seeking reliability and performance. Key Features: - High-strength Hollowtech II spindle interface for durability and stiffness - Compatible with HG 12-speed chains for smooth shifting - Single 40t chainring with 110 BCD for optimized gear ratios - Choice of gear range: 10-45t or 10-51t cassette options (sold separately) - 49.7mm chainline enhances clearance and stability on wide gravel tires - Lightweight design at just 812 grams for agile handling - Designed for gravel, cyclocross, and adventure cycling applications - Durable black finish for a sleek, modern look and corrosion resistance Enhance your gra