Shimano 105 FC-R7100 12Speed

Engineered Efficiency. 12-Speed Precision.

The Shimano 105 FC-R7100 utilizes Shimano’s legendary Hollowtech II technology, which integrates the bottom bracket axle with the right crank arm for unmatched stiffness and weight savings. The hollow-forged aluminum arms provide a rigid platform that ensures every watt of your effort is converted into forward motion, while the refined tooth profile is optimized for the narrower 12Speed chain, ensuring silent and instantaneous shifting.

Why the FC-R7100 is the Industry Benchmark:

• Hollowtech II Construction: By creating a hollow crank arm, Shimano maximizes strength-to-weight. You get a crankset that is stiff enough for professional sprinting but light enough to keep your climbing stats competitive.

• Optimized for 12Speed: Specifically designed to work with the tighter tolerances of Shimano’s 12-speed road systems (Di2 and Mechanical). The chainring spacing and tooth shaping provide the fastest, smoothest shifting in 105 history.

• Versatile Gearing Options: Available in 50-34T and 52-36T configurations. Whether you need a "compact" setup for steep mountain passes or a "mid-compact" for high-speed group rides, the R7100 has you covered.

• Sleek, Pro-Level Aesthetics: The deep, gloss-black finish and aggressive four-arm design mimic the top-tier groupsets, giving your bike a premium, modern look that commands respect in the peloton.

• Exceptional Durability: Unlike carbon alternatives, the forged aluminum construction is incredibly resilient against stone chips and the wear-and-tear of high-mileage seasons.

• Universal 24mm Spindle: Compatible with a massive range of frames using Shimano’s standard Hollowtech II bottom brackets, making installation and maintenance straightforward for any home mechanic.

Technical Specifications:

• Series: Shimano 105 R7100

• Speeds: 12Speed

• Technology: Hollowtech II

• Chainring Combination: 50-34T / 52-36T

• Crank Arm Lengths: 160mm, 165mm, 170mm, 172.5mm, 175mm

• Bolt Circle Diameter (BCD): 110mm (Asymmetric)

• Chainline: 44.5mm

The Alegro Perspective: When we’re building up a performance road bike like the Scott Addict, this is the crankset we recommend 90% of the time. It is virtually indistinguishable from Ultegra in terms of shifting speed and stiffness, but at a price that leaves room in your budget for a nice set of carbon wheels or a Hiplok Z Lok Combo V2. It’s the ultimate "workhorse" for the serious enthusiast.

Maximum Power. Minimal Weight. Lead the Pack with Shimano 105.