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When it comes to unusual crankset tech in grand tours, most cycling fans are aware of Froome's oval chainrings; however, unless they obsess over the details of every stage—including the gear ridden by stage hunters like Cummings from Dimension Data—they might miss out on the fact that there are non-Japanese alloy cranks claiming victories in cycling's biggest races. The 2INPowermeter Crankset Package combines Rotor's flagship powermeter with Q-Rings that aim to reduce the dead spot in your pedal stroke. Since the 2INpower crank arms are Cummings' weapon of choice and oblong chainrings have been repeatedly proven in theory by Froome, we can only assume the combination means that you'll be measuring watts with less wasted effort.
The theory of oval rings is simple: not every point in the pedal stroke contributes as efficiently to propelling the bike forward, so limiting time spent at those dead angles is a win for watt production. The tech behind measuring those watts is more complicated, so let's start with the internals. Instead of housing them in the spider or in attachments to the crank arms or chainrings, Rotor situates all of the electronics in the spindle. This provides more protection against the elements (be they rain, snow, or tarmac encountered during the inevitable user error), and it also helps to tidy up the crank's silhouette by eliminating bulbous protrusions at the crank arm/chainring interface—of course, Rotor's typically aggressive, Euro-race graphical treatment and iconoclastic chainring designs still manage to stand out.
While the electronics are all spindle-bound, the power measurement circuit encompasses both the spindle and the right crank arm, with both receiving four strain gauges for a total of eight. This seems excessive in an industry where five strain gauges is the high end of normal, but incorporating more gauges reduces the chance that external conditions (read: rapid changes in temperature) can adversely affect the 2INpower's accuracy. Since they're laid out in opposition, the eight gauges work as internal correctives to each other to provide more points of input, help the system reduce drift, and eliminate the need to constantly zero by establishing a more comprehensive body of aggregate data.
As with other power meter cranksets, the 2INpower is equipped with an accelerometer to read cadence; unlike other meters, Rotor's design measures cadence over 500 times per pedal stroke. While the benefits of mapping minute changes in cadence over each leg's power production are immediately obvious to any data obsessive, the potential is magnified exponentially when paired with Rotor's Q-Ring system, as we've done it here. It helps you chart the most efficient Q-Ring orientation possible to capitalize on the strengths of your pedal stroke while mitigating the weaknesses. The crank arms work just fine with traditional round rings, but adding Rotor's Q-Rings takes full advantage of the system's potential.
The 2INpower transmits data via ANT+ and Bluetooth Smart protocols, so chances are good that it's already compatible with whatever head unit you're running. It's also compatible with virtually all bottom bracket standards with the notable exception of BB90. The battery is fully contained and rechargeable via a magnetic connection in the proximal end of the crank arm. While it's recharging, Rotor provides a seamless data upload and management interface by partnering with TrainingPeaks.
- A power meter that takes Rotor to its fullest potential
- Eight strain gauges increase accuracy and reduce need to zero
- Measures left and right legs independently
- Charts cadence information 500 times per pedal stroke
- Electronics housed in spindle for protection from elements
- Rechargeable battery with magnetic attachment port
- Alloy construction proven in the world's biggest races
- Paired with Q-Rings to for charting maximum pedaling efficiency
- Item #RTR0030