Power meter bicycle
A Power meter bicycle is now better known under the name Power meter. The name power meter describes the function of such a power meter. A power meter measures the performance of a bicycle. To be more precise, the Powe rmeter measures the deformation of the material when an athlete applies force to a bicycle and can calculate the athlete's wattage from this. In order to measure this minimal material deformation, strain gauges can be attached to various points on the bike. The values measured there are transmitted via a transmitter and a wireless connection to the bike computer, where they are stored and displayed. Depending on where the strain gauges are attached, the power meter is designated. If the strain gauges are attached to the pedal axle, it is called a pedal power meter. Further possibilities to mount the strain gauges are the crank arms, the crank spider, the wheel hub or the crankshaft. There are different manufacturers for each of these types of power meters on a bicycle:
Pedal power meters, for example, are produced by the manufacturers Favero Electronics, PowerTap or Garmin. The pedal power meter from Favero is called Assioma and is available in a one-sided or two-sided measuring version. The one-sided version is the Favero Assioma Uno and the two-sided measuring power meter is the Favero Assioma Duo. The batteries of the Favero Assioma are charged at the power socket via a USB cable with a magnetic plug and are very popular because of this and the very easy mounting on the bike. Garmin offers a similar product, also with the possibility of a double-sided or a one-sided measurement, with the variants Garmin Vector 3 and Garmin Vector 3 S. The Garmin Vector 3 S is the only one with the Garmin Vector 3. The Garmin Vector 3 S is the one-sided measuring power meter. One of the few differences to the Favero Powermeter is the charging possibility. The Garmin Vector Powermeter as well as the Pedalpowermeter Powertap P2 are operated by the company PowerTap via battery and can therefore not be charged at the socket, but must be replaced after the battery life. A battery change is also very easy.
For the crank arm power meters there are among others the manufacturers Stages Cycling and 4iiii. With the crank arm power meters, the strain gauges are glued to the crank arm and measure the material deformation there. The transmission to the bike computer and the calculated power there is not different from other types of power meters on the bike. Stages also offers a power meter version for the crank groups Shimano Ultegra R8000 and Shimano Dura Ace 9100, which has a crank arm power meter on the left and a crank power meter on the right side. With this two-sided power meter, both sides of the crank are measured separately and a separate watt value can be output for each side of the crank.
This is the basic difference between a one-sided and a two-sided measurement, because a one-sided measurement duplicates the watt value on the other leg and assumes that both legs of an athlete are equally strong. Especially after severe leg or knee injuries, we recommend a bilateral power meter for performance measurement and training analysis in order to be able to analyze more accurate performance values.
Further Power meter manufacturers are the company SRM, the pioneer among the Power meter bicycle manufacturers, since this developed the Power meter already in the 80's, and the company Quarq, which belongs meanwhile to SRAM. These manufacturers install their power meters in the crank spider. There a single measurement is carried out and by the measured value the power of both legs is calculated and output, so that one also receives an exact bilateral power measurement. Not to forget the Spanish manufacturer Rotor, which measures the material deformation in the crankshaft. Here, too, we can speak of a very reliable system.
Ultimately, each power meter bicycle must be assessed individually and selected according to requirements and available material. If you have any questions, please feel free to contact our support team, we will be happy to help you choose the right power meter.