Dura-Ace R9100 Bluetooth Power Meter Crankset
Already proven in the pro peloton when paired with Shimano's flagship Dura-Ace drivetrain, the Pioneer Dura-Ace R9100 Bluetooth Power Meter Crankset adds data collection to your training, helps you analyze every ride, and doesn't compromise the drivetrain for those of us who appreciate a build where every component is the same make and model. Its sleek design integrates cleanly onto the crankset and features dual-leg strain gauges for independent pedal data and other detailed metrics. Newly updated, it transmits that data to any Bluetooth LE or ANT+ cycling computer, and pairing it with one of Pioneer's own cycling computers opens up an even wider world of torque vector analysis for those of us who want to dig into the real nitty gritty minutiae in search of marginal gains and a few extra watts.
The system measures pedaling force, direction, and overall efficiency via dual strain gauges bonded to the crank arms. Each sensor unit captures 12 points of rotation at 30-degree intervals by measuring minute changes in the shape of the crank caused when force is applied while pedaling. From this, force is calculated in both the direction of rotation and the radial direction. The combination of these two force components indicates the direction in which the total force is being applied, which is shown using the system's force vectors. Also, a magnet ring that attaches to the bottom bracket measures the position of the crank, allowing precise display of the force vectors at every 30-degree interval throughout the rotation.
The force vectors for one full rotation are then wirelessly transmitted to any Bluetooth LE or ANT+ head unit via the transmitter module bolted in the crankset's spider. The information centers around pedaling efficiency, giving riders the ability to target inefficiencies for improvement in training and racing. When pedaling efficiency is high, most of the rider's power is being used to rotate the pedals. So, the force measured in the direction of rotation at each of the 12 points is combined to give the total power output for that rotation. This system is more immune to the inaccuracies found in other power meters that don't gather information at 12 force vectors.
This data is then stored in long file form that can be accessed and analyzed after the ride. You're able to upload your log data to Pioneer's Cyclo-Sphere website, which lets you analyze left and right side pedaling efficiency, power, and force vectors, among many other types of data displayed in easy-to-understand graphs and numerical displays.
This system is paired with is Shimano's new FC-9100 Dura-Ace crankset, boasting a few subtle yet deliberate changes compared to its FC-9000 predecessor. It retains its proven four-arm design and widens the crankarm to move the chainline out by 0.5mm. This may sound imperceptible, but it's just enough to give the crankset broader compatibility with shorter chainstays and the growing number of road bikes built for disc brakes. Shimano also slightly reshaped the chainrings' gear teeth profile to adapt it to the chainline on disc brake-equipped race bikes. As with the 9000 model, this crankset sees the continuation of Shimano's Hollowtech II construction. Over the past few iterations of Dura-Ace, this manufacturing methodology has played an integral role in attaining weight reduction without sacrificing Dura-Ace's superior stiffness.
- A crank-based power meter with massive data capability
- Compatible with ANT+ and Bluetooth LE cycling computers
- Uploads data via Wi-Fi to Pioneer CycloSphere software
- Provides torque vector data when paired with Pioneer computers
- Small pods are protected from the elements with IP66 and IP68 resistance
- Allows you to use genuine Dura-Ace cranks and rings matching the rest of your group