Power Meter Buying Guide 2024: Which Power Meter Best Fits Your Budget and Needs

The power meter is the most revolutionary tool in modern cycling training. But with the various types and brands on the market, how do you make a smart choice?

This article starts with the principles behind power meters and provides a detailed comparison of each type to help you make the best decision.

Why a Power Meter Is Worth the Investment

The Advantage of Power vs. Heart Rate

Heart rate monitors were the most widely used training tool before power meters, but they have several limitations:

• Lag: Heart rate responds to intensity changes with a 15-30 second delay
• External interference: Temperature, caffeine, and sleep quality all affect heart rate
• Cannot quantify output: Heart rate reflects bodily stress, not the actual work performed

A power meter directly measures the force you apply to the pedals, with no lag and no external interference—it is the most objective training tool.

Detailed Breakdown of Power Meter Types

Pedal-Based Power Meters

Mounted on the pedals, these measure the force applied to the pedals during pedaling.

Major Brands:

• Garmin Rally series (SPD-SL or Look compatible)
• Favero Assioma series (top-tier choice)
• Wahoo SPEEDPLAY series

Advantages:

• Mounted on the pedals, so they can be swapped between different frames
• Can measure power output for the left and right legs separately
• Simple installation (only requires a pedal wrench)

Disadvantages:

• You must use the brand’s specified pedals (this changes your pedal options)
• Pedal power meters are prone to impact damage (pedals are the closest component to the ground)

Recommendation: The Favero Assioma Duo (dual-sided measurement) is currently the best value-for-money choice among pedal-based power meters, offering high accuracy and good reliability.

Crank-Based Power Meters (Spider/Crank Arm)

Mounted on the crank arm or crank set, these measure the force applied to the crank.

Major Brands:

• 4iiii (single-sided, mounted on the left crank)
• Stages (single-sided, mounted on the left crank)
• Shimano’s own power meters (mid-to-high-end models)

Advantages:

• Does not affect pedal choice
• Mounted in a familiar crank position
• Single-sided models are more affordable

Disadvantages:

• Single-sided models only measure the left leg (assuming the right leg is the same), resulting in lower accuracy
• Switching frames requires removal and reinstallation

Hub-Based Power Meters

Mounted on the rear hub, these measure the torque transmitted to the rear wheel.

Major Brands:

• PowerTap G3 (currently declining in market position)
• DT Swiss power hubs

Advantages:

• Unaffected by weather (sealed inside the hub)
• High accuracy

Disadvantages:

• Tied to a specific wheelset, making swaps cumbersome
• Measures the power delivered to the rear wheel (accounting for drivetrain efficiency losses), which may read lower

Smart Trainers with Power Measurement

Not strictly power meters, but smart trainers also provide power data, suitable for indoor training.

Major Brands:

• Wahoo KICKR Core (great value)
• Tacx NEO 2T
• Garmin Tacx FLUX S

Accuracy Comparison

Power meter accuracy is typically expressed as “±%”:

Type	Accuracy (Industry Standard)
High-end pedal-based (Assioma)	±1%
High-end crank-based	±1-1.5%
Entry-level crank-based	±1.5-2%
Hub-based	±1-2%

Practical Impact:
For training purposes, ±2% accuracy is sufficient (the difference is smaller than daily fluctuations in your body’s condition).
For racing scenarios (such as time trials), higher accuracy matters more.

Single-Sided vs. Dual-Sided Measurement

Many entry-level power meters only measure the left leg and then multiply the value by 2 to estimate total power.

The Problem: Most people have unequal left/right leg power output (the difference can be 5-15%)

Is Dual-Sided Measurement Worth It:

• For training purposes: single-sided is sufficient
• For understanding left/right imbalance: dual-sided is more accurate
• For competitive use: dual-sided is more precise

Price Comparison (Taiwan Retail, 2024)

Product	Type	Accuracy	Taiwan Price (approx.)
Stages Gen3 (left side)	Crank single-sided	±1.5%	NT$8,000-12,000
4iiii Precision 3 (left side)	Crank single-sided	±1%	NT$8,500-13,000
Favero Assioma Uno (single-sided)	Pedal	±1%	NT$10,000-15,000
Favero Assioma Duo (dual-sided)	Pedal	±1%	NT$15,000-22,000
Garmin Rally RS200 (dual-sided)	Pedal	±1%	NT$20,000-28,000
Shimano RS with power meter	Crank	±2%	NT$30,000-50,000 (groupset)

How to Choose: A Decision Framework

Question 1: Do you own multiple bikes?

• Yes → Pedal-based (can be swapped between bikes)
• No → Any type works

Question 2: What pedals do you use?

• Look/SPD-SL system → Consider Garmin Rally or Favero Assioma
• Shimano SPD (flat) → Choose crank-based

Question 3: What is your budget?

• Under NT$10,000 → Single-sided crank-based (Stages or 4iiii)
• NT$15,000-25,000 → Dual-sided pedal-based (Favero Assioma Duo)
• NT$25,000+ → High-end options (Garmin Rally or brand OEM)

Conclusion

The core of choosing a power meter comes down to “your riding style and budget.”

For a first purchase, the Favero Assioma Duo (if you use Look pedals) or the Stages Gen3 (if you want to keep pedal flexibility) is recommended—both offer the best value for money and are the most popular choices among amateur riders.

Once you start training with a power meter, you’ll wish you had bought one sooner.

Related Reading

• 2025 Ultimate Power Meter Buying Guide: Pedal, Crank, or Hub—How to Choose?
• 2025 Complete Power Meter Buying Guide: Best Choices from Entry-Level to Advanced
• In-Depth Analysis of Cycling Pedal Power Meters: Garmin Rally vs Favero Assioma vs Wahoo Speedplay
• Power Meter Buying Guide: Comparing Three Options—Pedal, Crank, and Hub