Road bike power meter
A road bike power meter serves the cyclist to measure and record his own performance. This in turn is important for training planning and control. The performance measurement by a power meter is, however, also a big factor in competition, which has been used by all professional teams for years. In cycling, too, in times of digitalization the advantages of this are tried to use. The power meter provides the cyclist with values for total power or for the left-right distribution of power. Power meters on racing bikes are often supplemented by a heart rate monitor. Before the time of the Powermeter the performance was tried to determine on the basis the data of the heart rate. The interaction of the performance values of the power meter on the bicycle and the heart rate of the athlete makes an analysis of the data more holistic. The different values can then be used to evaluate the performance more accurately. Both the data from the power meter and the data and values from other sensors are transmitted via ANT+ or Bluetooth to the respective bike computer, where they are stored and displayed. It is therefore important to ensure that the bicycle computers and fitness watches often used in the triathlon scene are compatible with either Bluetooth or ANT+. Most Garmin, Wahoo, Lezyne, or Cycle Ops devices have these standards and are therefore compatible with the various sensors. The power meters on the road bike must also be compatible. The pedal power meters, for example, are not suitable for the mountain bike sector due to the pedal plates used, which are based on the Look company by all manufacturers of pedal power meters. Pedalpowermeters are very popular among triathletes because they can be easily and quickly exchanged between different bikes. The companies Garmin, Favero and PowerTap are among the manufacturers of pedal powermeters. However, the latter company was bought by Quarq, so that the Powertap P2 and PowerTap G3 hubs are now also distributed by Quarq. Another possibility to install the power meter on the road bike is the crank arm. The US company Stages Cycling, for example, uses this variant. There the strain gauges are mounted on the crank arm and covered with a battery compartment. In a small box on the inside of the left crank arm is then the road bike power meter and the battery with which it is operated. This is one of the simplest forms of road bike power meter but still very reliable and accurate. For this reason some other manufacturers have tried to reproduce this type of powermeter. The Stages Powermeters are available for most of the shifting groups from the big suppliers like Shimano, FSA, SRAM or Campagnolo, because the power measurement is mounted on the original crank arms of the individual manufacturers. The company Quarq mentioned in the upper part of the article, on the other hand, produces powermeters like SRM, which measure the power in the crank spider. The powermeters are also compatible with most shift groups, but require the entire crank to be removed. When reassembling, the compatibility with the bottom bracket has to be considered. If you have any questions about compatibility with a suitable bottom bracket, our support team will be happy to help you at any time. However, the Spanish manufacturer Rotor should not be missing from an overview of the different types of power meters on racing bikes. As the only manufacturer the Spaniards install the power measurement directly in the crankshaft. The strain gauges are mounted there and the battery compartment is invisibly installed in the crankshaft. The Rotor Powermeter is also available in different versions, both for racing bike and mountain bike. For both ranges there is also the Rotor 2Inpower DM Powermeter. Like the pedal power meters Favero Assioma Duo or Garmin Vector 3 which measure on both sides, this can show the cyclist an exact distribution of the wattage on the left and right. One-sided measuring systems like the Favero Assioma Uno simply double the measured values and therefore cannot display a distribution.