2025 Ultimate Power Meter Buying Guide: Pedal-Based, Crank-Based, or Hub-Based?

Why Do You Need a Power Meter?

A power meter is the only tool that lets you objectively quantify your riding intensity. Heart rate is affected by weather, sleep, caffeine, and countless other factors, and perceived effort is even less reliable. But power is power — 200 watts is always 200 watts.

Types of Power Meters

1. Pedal-Based Power Meters

Representative products: Garmin Rally, Favero Assioma, LOOK Powermeter

Pros:

• Easy installation, just like swapping clipless pedals
• Can be transferred between different bikes
• Measures left/right power balance simultaneously (dual-sided versions)

Cons:

• Limited to specific cleat systems (SPD-SL, LOOK, SPD)
• Typically 20-50g heavier than standard pedals
• Thicker pedal body results in a higher stack height

Best for: Riders with multiple bikes, or anyone who wants simple installation

2. Crank-Based Power Meters

Representative products: Stages Power, 4iiii Precision, SRAM Rival/Force/Red AXS Power

Pros:

• Usually the most affordable option (single-sided versions)
• Doesn’t restrict pedal choice
• Minimal added weight

Cons:

• Single-sided versions only measure one leg and double the reading to estimate total power
• Installation may require specialized tools
• Switching bikes requires a compatible crank

Best for: Budget-conscious riders, or beginners wanting to try power-based training

3. Hub-Based Power Meters

Representative products: PowerTap (discontinued, but still available on the secondhand market)

Pros:

• Measurement point closest to actual drive output
• Doesn’t affect crank or pedal choice

Cons:

• Tied to a specific wheelset
• Shrinking market availability
• Cannot measure left/right balance

4. Spider-Based Power Meters

Representative products: Quarq DZero, Power2Max NG

Pros:

• High accuracy (typically ±1%)
• Dual-sided measurement
• Doesn’t affect pedal or crank choice (but requires a compatible chainring spider)

Cons:

• Higher price point
• Installation requires replacing the chainring spider

Accuracy Comparison

Type	Typical Accuracy	Consistency
Spider-based	±1-1.5%	Very High
Pedal-based	±1-2%	High
Crank-based (dual-sided)	±1.5-2%	High
Crank-based (single-sided)	±2-5%*	Moderate

*Error in single-sided power meters mainly comes from the assumption of left/right leg balance

Best Value Picks for 2025

1. Best entry-level: 4iiii Precision (single-sided) — approx. NT$8,000-10,000
2. Best mid-range: Favero Assioma Duo-Shi (dual-sided pedal-based) — approx. NT$18,000-22,000
3. Best high-end: Garmin Rally RK200 (dual-sided LOOK cleat) — approx. NT$28,000-32,000

Buying Advice

1. If your budget is limited, a single-sided crank-based power meter is the best entry point
2. If you own multiple bikes, prioritize a pedal-based power meter
3. If you want maximum accuracy, choose a spider-based or dual-sided pedal-based power meter
4. Don’t give up the cleat/pedal system you love just for the sake of a power meter

Related Reading

• Power Meter Buying Guide: A Complete Comparison of Pedal-Based, Crank-Based, and Hub-Based Options
• Power Meter Buying Guide: Comparing Pedal, Crank, and Hub Solutions
• Complete Comparison of Road Bike Power Meter Types: Pedal-Based, Crank-Based, Spider-Based, and Hub-Based
• 2024 Power Meter Buying Guide: Which Power Meter Best Fits Your Budget and Needs