Power is the most consistent and quantifiable measure of training and race performance. Power measures the direct output of your muscles. This differs from measurements like heart rate - an aerobic response that is an indicator of effort and conditioning - or speed / cadence - a result influenced by many factors.
Power = force x velocity. It shows your ability to move yourself and your bike over a given distance and time. It is independent of external factors like wind resistance and incline - the only direct and real time measure of your effort.
Know this concept. Threshold is the maximum power output you can effectively maintain while removing lactic acid produced. This is the difference between quantifiably knowing how hard you can push yourself, and having a "feel" for it.
A power meter is your energy display unit. Once you've trained and tested with power, you understand you much you have to give. The power meter shows how much you are using so you can effectively pace yourself for your training or race.
Quarq D Zero & SRAM AXS
Quarq's next generation power meter, available on its own, or as part of the SRAM RED AXS Power Meter Crankset.
Pedal based power meter that is easy to install, move and connect to your Garmin ecosystem.
Single and dual sided crank meters - highly accurate with 12 points of measurement per pedal stroke.
The original power meter from the founders of the power based training. Crank based power that measures your torque at four points.