Pioneer is well versed in the world of electronics and it's taken that knowledge to the cycling world creating a powermeter that's made quite the impact in power measuring circles. It's had the opportunity to test the power meters under the sport's most elite athletes with teams like Team Lotto and Giant-Alpecin where these meters are subjected to harsher conditions, longer races and training, and if we're guessing, more power washing, than what we'll ever subject to our own bikes. It's safe to say that Pioneer has its design dialed and if you're looking to take your training to the next level, you're looking at the right product. The system here, the Ultegra R8000 Bluetooth Power Meter Crankset, is a powermeter that gives you a sleek and integrated package providing extremely accurate feedback from its dual-leg strain gauges to your bike's computer. Pioneer's system monitors pedaling forces, cadence, and efficiency via its dual strain gauges housed on both crankarms. The transmitter bolts directly to the Shimano spider for a smooth profile and seamless integration. The sensors have the ability to capture 12 points of rotation per leg, at 30-degree intervals. They work by measuring minute deflection in the shape of the crank when pedaling forces are applied. This force is calculated in both the direction of rotation and the radial direction. Plugging the force and velocity of the crankarms into an equation, power, measured in watts, is accurately formulated. To further measure efficiency, a magnet ring attaches to the bottom bracket and measures the position of the crank displaying force vectors at every 30-degree interval throughout the pedal stroke. The force vectors of each rotation are then wirelessly transmitted to your Bluetooth LE or ANT+ head unit of choice, or Pioneer's SGX-CA900 and 500 models, for displaying the pedaling efficiency. When used for training and racing, the goal is to target these efficiencies whenever possible to get the most out of ev...