Garmin Rally RK100 Power Meter

Your FTP, or Functional Threshold Power, is key for setting your personal power training zones. As you train more and get fitter, your FTP will likely go up. Most people should re-test their FTP every 4 to 8 weeks. This is extra helpful during periods of focused structured training. Testing often makes sure your power training zones are correct for how fit you are right now. This helps you train smarter and ride better.

Knowing your watts tells you your total power. But some cycling power meters give you more helpful details, called advanced metrics. Your left/right balance shows if one leg is working harder than the other. If they are very uneven, it could make you less efficient or even cause injury. Seeing this helps you work on pedaling more evenly. Other stats, like pedaling dynamics, show how smoothly you push the pedals. These details can help you pedal better and boost your performance.

When selecting a power meter, consider accuracy, battery life, compatibility with your bike, ease of installation, and your budget. Also think about whether you need single-sided or dual-sided measurement, and which data metrics are most important for your training goals.

For a beginner, the best cycling power meter often depends on your bike and what you want to spend. Pedal-based power meters are easy to move between different bikes. This makes them a good choice if you ride more than one bike. Crank arm-based power meters (especially ones that measure just one side) can cost less. Spider-based and hub-based systems are more built-in but might only fit certain bike parts. Think about how easy it is to put on your bike, if it works with your bike parts, if you want left/right balance data, and the price when you decide.

Yes! Let's say you are doing intervals where you ride hard for short times, aiming for your Threshold zone (Zone 4). You'll use your power meter to stay in the right range of watts for that zone. Watch your heart rate too. If it's much higher or lower than normal for that power, you might be tired, low on fluids, or stressed. Also, use RPE (Rate of Perceived Exertion), which is how hard the effort feels to you. If the effort feels much harder than usual for that power and heart rate, something else might be affecting your ride, like poor sleep. Using all three together gives you a clearer picture of how your body is doing during training.

Pedal-based power meters like the Favero Assioma Duo offer easy installation and transferability between bikes, while crank-based systems like the 4iiii Precision 3+ typically provide longer battery life and add less weight. Pedal systems often offer dual-sided measurement, while some crank systems only measure one side.

Power meters can be valuable for amateur riders serious about improving their performance. They provide objective data on your effort and progress, allowing for more structured and effective training. However, casual riders may find heart rate monitors sufficient for their needs.

Most high-quality power meters today offer accuracy within ±1-2% of actual power output. Some specialized units like the Verve InfoCrank Classic claim even higher precision. For most riders, accuracy within ±2% is more than adequate for effective training.

Battery life can vary significantly between power meter types. Pedal-based systems typically offer 50-120 hours per charge, while some crank-based systems like the 4iiii Precision 3+ boast up to 800 hours of battery life. Consider your riding habits and charging preferences when evaluating battery performance.