Serious cyclists always want to gain as much data about their rides as possible. We used to be happy with speed, distance, and average heart rate, but now, power meters provide even more insight into our rides by tracking real-time effort measured in watts. This way of gaining extra data is becoming more popular and increasingly tempting for cyclists. So, if you've ever wondered, "What power meter do I need for my bike?" keep reading. 
 
In this blog, we'll break down the basics of power meters. You'll learn the different types and how to choose the best one for you. 

Power meters deliver an exact measure of your pedalling effort. Heart rate monitors are great but can lag or fluctuate due to external factors. However, power data gives immediate feedback on actual work done. Therefore, it helps you pace properly and avoid overexertion early in rides. 
 
You can also use a power meter to guide targeted workouts and intervals, focusing on threshold training, sprint power, or sustained climbing efforts. With real numbers in front of you, you can monitor your improvements and see how small changes in technique translate into bigger gains. 
 
In short, power data drives motivation by showing real progress. Hence, the question remains: What power meter do I need for my bike? 
 

 
You'll discover four main categories when you look into the various power meters available. Each design carries its own strengths and potential drawbacks. They include pedal-based, crank-arm-based, spider-based, and hub-based meters. Choosing between them often depends on your bike setup and budget. 

 
Pedal-based systems house strain gauges in the pedals themselves. They're popular because you can easily swap them between bikes. However, it's worth noting that some cleat systems may limit your pedal choices. Additionally, the pedals sit exposed, making them vulnerable to impacts, so they may not be the best choice for mountain bikers. 
 
Nevertheless, pedal-based meters are convenient for riders with multiple bikes, and maintenance and calibration are more straightforward. They allow quick transfers without disassembling cranks or chainrings. 

Crank arm-based designs attach to one or both crank arms. These measure torque in the arm, often inside a sealed compartment. Many single-sided meters collect data from the left crank only. Then, they double it for a total power approximation. 
 
Dual-sided units track each leg independently for deeper insights. Installation might require replacing or removing your existing crank arm. Prices vary, but single-sided tends to be more affordable. 
 
Single crank arm-based power meters are accurate, though you can't monitor any imbalance between each pedal. With this in mind, consider a dual-sided system if you want more details about your pedalling. Another advantage of this system is that they are protected from debris and integrate neatly into your setup. 
 

Spider-based units measure torque at the chainring spider. They capture combined power from both legs rather than splitting readings. You can easily change chainrings as long as they use a compatible direct-mount or bolt pattern. 
 
This approach keeps sensors sheltered within the crankset, making them durable in varied weather conditions. Additionally, spider-based meters often boast consistent accuracy under load. Rotors' INspider is a great example of a spider-based power meter. 

Hub-based meters measure torque through the rear wheel hub. These were more common when power meter technology was new and are not commonplace these days. 
 
For this system, you'd need a specific wheelset or hub built for this purpose. You're also limited by wheel choices and rim preferences. While accurate, hub-based systems feel less versatile today, so modern cyclists often prefer crank or pedal-based solutions. 

Rotor Bike has developed a reputation in the bike component world for precision engineering, durability, and modular designs. When it comes to power meters, our product range covers single-sided and dual-sided crank-based meters. We also offer spider-based systems that support round or oval chainrings. 
 
While browsing our power meter lineup, you'll see multiple options to suit your budget or performance goals. Additionally, our approach simplifies chainring changes and maintenance. 
 
Let's take a look at some Rotor Bike power meters as some great examples of what's available: 

The Rotor 2INpower system measures the left and right legs independently. It uses sensors located inside both crank arms to track real-time torque. The big advantage of this system is that it reveals potential pedalling imbalances. Therefore, you can correct issues through focused drills or bike fit adjustments. 
 
The Rotor 2INpower uses a rechargeable battery that powers the system, lasting a long time between charges. It also pairs with your device via ANT+ and Bluetooth so you can analyse your data quickly and easily.  
 
Riders who want meticulous data often pick dual-sided units, so if you're aiming for ultimate analysis, 2INpower is a fantastic choice. 

INpower measures power from the left crank and then doubles that reading. This system provides consistent power data in a more affordable package. Its design hides strain gauges within the crank spindle, protecting it from water and mud ingress. Many cyclists who use the INpower combine it with new chainrings for a sleek look. Another great characteristic of the Rotor INpower is that it's quick and easy to calibrate, ensuring accurate numbers for each ride. 
 
Even though it only measures data from the left side, you can still train effectively for FTP intervals or threshold workouts. Meanwhile, you avoid the higher price tag of dual-sided systems. 

The Rotor INspider sits in the chainring spider, reading total power from both legs. It accommodates both round and oval chainrings in various sizes, making it appealing to more cyclists. This is a flexible solution thanks to the direct-mount system and suits riders who like to play with their gearing for optimum results. 
 
The device is fully sealed, making it robust in nasty weather. It uses a built-in rechargeable battery, simplifying the user experience. 

The best answer depends on your goals, budget, and how accurately you want your power data to be. For example, dual-sided is the way if you want advanced data from both legs. Alternatively, single-sided does the trick if you're happy with straightforward power data. 
 
You should also consider a few other factors, as you may benefit from a spider-based system if you swap chainrings frequently. In addition to this, consider your bike's bottom bracket standard before fitting a power meter. However, Rotor offers adapters for many frame specifications, easing compatibility concerns. 
 

 Choosing a power meter needn't be stressful or confusing. All you need to do is evaluate your priorities and pick what suits you best.  
 
Rotor's lineup simplifies the process by covering all major preferences. 2INpower, INpower, and INspider each offer unique advantages. Any of them can help you achieve performance gains when used correctly. Browse our online shop to see which power meter suits your needs best. 

Happy riding #ROTORian