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The Magene P505 is a well priced spider-based cycling power meter with a number of options available to fit different cranks and chainring combinations. I've been riding the P505 since February 2022 and have collected over 70 comparative data sets against other power meters and smart trainers. To keep things short, this video covers the data from three recent rides across indoor, road, and gravel with the latest firmware that is being released this week.
P505 Technical Specifications:
● Type: Spider
● Wireless: ANT+ Power, BLE
● Data: Power, Cadence, Balance, PS.
● Power: ±1.5%
● Power Range: 0W-2500W
● Cadence: 20-250rpm
● Calibration: Manual Zero, Back pedal zero.
● Battery: Internal. USB Rechargeable. Up to 200hrs.
● Waterproof Rating: IPX7
● Management / FW Upgrades: Magene Utility App (IOS / Android)
● Power Scaling: ±10%
● Weight: 110g (P505-S1078)
● Warranty: 2 Years.
● Manufacturer Suggested Retail Price: US$349
Links:
Magene P505 Official Website: https://bit.ly/3WxE141
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Video Index:
0:00 Intro
0:21 Technical Specifications
1:54 Pricing
2:00 Observations
2:35 Data Review - Lama Lab Test
6:16 Data Review - Road Ride
7:22 Data Review - Gravel Ride
8:36 Data Summary
9:06 Should You Choose This Power Meter?
9:17 More Coming Soon...
9:30 Wrap Up
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https://gplama.com
#Cycling #PowerMeter #Magene
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Bike part mentions in this video
PowermeterMagene Power Meter PES P505 Base 4 Bolt 110 BCD 24mm Cadence Pedal Balance Ant Steel Spindle Crankset Chainring for Shimano Sram
Created: July 04, 2025The reviewer provides a detailed analysis of the Magene P505 spider-based power meter, which they have tested across road, gravel, and indoor cycling over 10 months. They highlight its compatibility with various crank sets including SRAM 8-bolt, SRAM 3-bolt, and Rotor modular crank sets, as well as Magene's own QED crank set. The reviewer notes the power meter's support for ANT+ and Bluetooth, its claimed power accuracy of ±1.5%, and its ability to measure cadence, balance, and pedal smoothness. They also mention its internal battery life of up to 200 hours, IPX7 waterproof rating, and two-year warranty. The reviewer concludes that the power meter provides reliable and stable data, with no major spikes or drifting, and is suitable for diagnosing other power meter issues.
AI-Summary
Pros
- Reliable and stable power data
- No major spikes or drifting
- Good battery life (up to 200 hours)
- IPX7 waterproof rating
- Supports ANT+ and Bluetooth
- Measures cadence, balance, and pedal smoothness
- Two-year warranty
- Compatible with multiple crank sets
- Can be used to diagnose other power meter issues
- Internal temperature compensation (implied by performance)
Cons
- Left-right power balance estimation is not as accurate as dual-sensor systems
- Initial cadence data was jagged but improved with firmware updates
Key Points
- Spider-based power meter
- Compatible with SRAM 8-bolt, SRAM 3-bolt, Rotor modular crank sets, and Magene QED crank set
- Supports ANT+ and Bluetooth
- Power accuracy: ±1.5%
- Power range: 0-2500 watts
- Cadence range: 20-250 RPM
- No magnet required for cadence
- Manual zero or back-pedal zeroing
- Internal battery, USB rechargeable
- IPX7 waterproof rating
- Weight: 110 grams (claimed), 100-120 grams (actual)
- Two-year warranty
- MSRP: $349
