Whether you're looking to take your training to the next level or you simply want a better way to measure energy expenditure, a power meter is your best bet. And the Power Cranks 105 Upgrade Kit are no exception. With our lightweight power sensors on a Shimano 105 crankarm, it's the perfect way to enter the power meter game. The development of Power Cranks began with our Human Performance Team looking at riders in realistic scenarios on the bike. Historically, power meters have been validated by two different methods—one is by measuring the produced torque by applying a static, linear load to a crankarm or chainring, while the second uses a power generating motor to pedal the bike. Well, cycling is neither static nor linear, and humans apply power much differently than a machine. So, we found that neither of these methods answers the 'real-world' accuracy question. To get the best test for accuracy, in all types of riding scenarios, we built our own cycling treadmill, the WinMill, to measure power output to a known truth. This new benchmark lets us evaluate accuracy under all riding conditions—seated versus standing, various power and cadence levels, different weights, and a myriad of gear. This data acquisition process is our gold-standard for testing power meters, and through our testing and external validation from the Locomotion Lab in Boulder, Colorado, Power Cranks have been proven to have the highest accuracy in real-world scenarios (+/- 1.5%). The Power Cranks are also easy to live with, with class-leading temperature compensation firmware and waterproof enclosures. Calibration is only required during seasonal-type fluctuations in temperature, and the included wrench makes battery swaps a breeze. - +/- 1.5% real-world accuracy tested on the WinMill and validated by the Locomotion Lab in Boulder, CO. - Works with ANT+ and Bluetooth devices. - Easy set-up and diagnostics with the Specialized Power app. (iOS and Android versions available). - Shimano 5800 generation 105 left-side power measurement. - Right crankarm and spider NOT included. - Available in 170-175mm crankarm lengths.
$172.00 - $228.99
SRAM's Rival OCT Crankset utilizes SRAM's Open Core Technology to save weight and put more power to the road. The crankarms are hollow and forged from 6066 aluminum for maximum strength with minimum weight. Because lightness is nothing without toughness, the Rival proudly boasts SRAM's hard-anodized PowerGlide chainrings for long-lasting durability and quick shifting. Plus, the Rival crankset comes with SRAM's smooth-spinning GXP bottom bracket.
Shimano's CX50 Crankset features lightweight, hollow-forged aluminum arms and two-piece construction for high-efficiency power transfer to get you through the mud and on the podium. The 36/46 chainring setup is a 'cross friendly combination, and Shimano's wide pitch crank design eliminates chain rub in cross-gear situations. SG-X chainrings boast the shift-at-will performance Shimano is known for.
$99.99 - $104.99
The Shimano SLX FC-M7100 crankset for MTB offers the simplicity of a 1x drivetrain with the stability and compatibility of Hollowtech II technology. - Chainring sold separately - Hollow forged crank maximizes power transfer while limiting weight - Shimano's Hollowtech II technology provides the best balance of stiffness, strength, weight and rotating performance - Features 52mm chainline - 172mm Q-factor - Number of Chainrings: No Rings Included - Chainline/Hub Compatibility: 141/148 Boost Hubs - Crank Length: 165mm - Crank Intended Use: Mountain - Pedal Spindle: 9/16" - Spindle Interface Type: Shimano Hollowtech II - Drivetrain Speeds: 12 - Chainring BCD: Direct Mount
Wheels Manufacturing BB30 Bottom Bracket Adaptor for Hollowtech II Cranks adapts 24mm Spindle Cranks (Shimano Hollowtech II, FSA, Race Face EXI, etc.) to work on BB30 frames. Simply tap the adapters into the 6806 bearing in the BB shell, then install the spindle and cranks. Use Wheels Mfg Crank Spindle Spacers to adjust your chainline, or take up any side-to-side movement in your cranks. These spacers are machined from engineering-grade Delrin.
Shimano Altus M311 cranksets provide durability and reliable shifting for triple chainring drivetrains. - Hyperdrive SG-X chainrings - 7/8-speed compatible - Spindle interface type: Square Taper JIS
$13.99 - $19.99
• Square taper interface • Only includes left crank
• Square taper interface • Only includes left crank • 175mm length
Machined aluminum spacers for freehubs. Great for fine tuning freewheel and cassette placement or improving chainline. Also good for bottom bracket spacing with BSA BB cups. - Inner Diameter: 35.0mm - Outer Diameter: 40.7mm - Material: Aluminum - Finish: Polished - Bags of 10
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