Shimano's 12-Speed R7100 105 Crankset is an attractive aluminum crank with hollow arms for lightweight, rigidity, and durability, while keeping cost as manageable as possible. The newly designed crank arms offer an optimized balance between lightweight and efficiency. The crank, formed with hollow aluminum technology, is anodized with a beautiful gloss black anodized finish, giving it a luxurious look. The GFRP resin ribs on the back of the chainrings are Shimano 105's unique structural design that achieves both thorough weight reduction and crisp shifting performance.

With the R7100-series Shimano drives their Ultegra-level components to 12-Speed, in conjunction with a decisive move to Di2-only equipped drivetrains. The efficiency and reliability of the electronic Di2 shifting system has been well proven, and this new generation brings many changes, including wireless communication from the shifters, which makes integrated cockpit set-ups much simpler, while also an increase in shift speed from the already lightning fast response of the previous generation. Yet the crux of any drivetrain is the crankset, and the design of the crankset has also been improved, building off the stiffness the line has been known for, but making changes to the construction and materials. The crankset delivers the power, drives the chain, and handles the shifting power of the Di2 front derailleur with ease no matter what combination you shift to or from. It draws on design and engineering with the Dura-Ace and Ultegra 12-Speed versions, at much more attainable price.

While much of the R7100 Crankset carries a construction process and resemblance to R7000 offering it replaces, a more detailed examination which shows an updated version of the spider-arm design that has achieved an optimal balance of stiffness, strength, weight and rotational performance. This change also moves away from asymmetric arm spider design, as well as offering a striking visual presentation, which is more muscular and geometric. The proven Hollowtech crankarm design keeps the unit as light as possible, while producing the stiffest crank and chainring interface available, and the familiar 24mm Hollowtech II spindle integrates the bottom bracket axle with the right crankarm for more stiffness and weight savings to achieve a high-dimensional balance. The rigidity of the crankset ensures pedaling efficiency throughout the pedaling cycle. The two-piece aluminum/GFRP large chainring structure cuts weight yet maintains strength and has resin form that leads to faster, more precise front shifting, while crucially being able to handle the power of the Di2 front derailleur under any chain angle or gearing combination.

With 165, 170, 172.5 and 175 mm lengths available, the ideal option for you is here. With the addition of a 12th cog to the cassette, shifting has only gotten faster and more precise, if more technically challenging. Faster cadences yield faster shifts, and the Di2 only R7100-series components maximize this experience with stunningly quick and excellent accuracy. Shimano offers the R7100 crankset in a the most popular 50-34T set-up, along with 52-36T combination. 105 12-speed brings two cassettes to the table, in an R7100 11-34, and in an HG70111-36 tooth option, the latter of which is only compatible with the105 R7150 Rear Derailleur- not Ultegra or Dura-Ace 12-Speed. The gearing combinations and cog steps offer great efficiency, a must for all higher cadence riders, most ideally those who do a lot of climbing. Many pro cyclists now use these wider cassette gearing ranges in the high mountains for the same reason, as efficiency within a rider's optimal power output range is critical to maintaining speed, answering attacks, and spinning away from those who can't hold the pace. You can have the same advantages, applied in the way you enjoy cycling.