The GEOID PM500 is a budget spider-based power meter crankset that offers accurate power data for longer intervals and steady efforts, with a claimed ±1.5% accuracy and 300-hour battery life. It is widely considered a rebranded Magene P505/P515, sharing the same module and app, and is praised for its value at around $140-180. However, it is heavier than comparable Shimano cranks, has a proprietary crank interface that limits chainring and crank arm compatibility, and exhibits accuracy issues in very short sprints and occasional data dropouts or unit failures.
Pros
- Accurate power readings for longer intervals and steady efforts, with minimal deviation from reference power meters like Favero Assioma, Garmin Rally, and Tacx Neo 2T.123
- Very affordable at around $140-180, significantly cheaper than comparable power meters like Magene P515.456
- Long battery life of 300 hours, with magnetic charging.452
- Easy installation similar to Shimano cranksets, with 24mm spindle and compatible with Shimano bottom brackets.147
- Compatible with major cycling apps and computers (Garmin, Wahoo, Zwift, TrainingPeaks, Strava) via ANT+ and Bluetooth; no app activation required.563
- Includes cranks, installation tools, charger, and manual; can reuse existing Shimano chainrings.152
- Good thermal compensation and maintains calibration after high-power sprints, unlike some cheaper meters.17
- Senicx PR3 crank arms provide more clearance for front derailleurs than Magene PES505 arms.6
Cons
- Heavier than comparable Shimano cranksets: 680g vs 540-545g for Shimano 105, about 100g more.123
- Proprietary crank interface limits compatibility with other crank arms; chainrings cannot be swapped with other standards without potential shims.62
- Accuracy issues in very short sprints (1-3 seconds), with deviations up to 6-8%; not suitable for precise short efforts.2
- Occasional data dropouts and calibration difficulties with certain devices (Coros Dura, older Garmin Edge 800); Bluetooth connection more stable than ANT+.26
- Some units have failed completely, showing 0W while still transmitting cadence; may require head-unit swap to recover.62
- Chainline may be tighter than Magene PES505, potentially causing chainstay clearance issues with 2x setups.6
- Power scaling (slope adjustment) feature does not work, as confirmed by support.7
- Limited long-term reliability data; some concerns about potential offset shift after sprints (not confirmed for this model).3
Key Facts
- Weight: 680g including cranks (some sources report 668-680g); about 100g heavier than Shimano 105 cranks (540-545g without chainrings).563
- Accuracy: claimed ±1.5%; measured within -1.5% to +1.7% for intervals longer than 10 seconds, but deviations up to 6-8% for 1-3 second sprints.216
- Battery life: 300 hours; magnetic charging cable.452
- Spindle: 24mm, compatible with Shimano bottom brackets; 110 BCD four-bolt chainring interface.145
- Proprietary crank interface (Senicx PR3 arms) not compatible with standard Easton, SRAM, or Shimano crank arms; chainrings can be swapped but may require shims.62
- Based on the same module as the Magene P515, sharing FCC registration images; uses the Magene utility app for setup and calibration.263
- Maximum power: 2300 watts; IP67 waterproof rating; operating temperature up to 50°C.24
- Price: approximately $170-$250 (often ~$179, ~€140, ~£165); in China about 1000 RMB, roughly 2/3 the price of Magene P515.526
Sources
- 1Веломастерская love.bikeМощемеры ПО НИЗУ РЫНКА: Geoid PM500, Leoseek
- 2MyBikePartsGEOID PM500 im Langzeittest: genau genug, aber mit einem Problem
- 3r/bicyclinggeoid pm500 vs direct drive trainer power
- 4Dave NoakesThe BEST Budget Power Meter?! Geoid PM500 Installation - AliExpress
- 5Crank & SprintsIs Commuting Making You A Faster Cyclist? We Tested It With GEOID PM500
- 6ChinertownGeoid PM500 power meter
- 7r/bicyclinggeoid pm500 vs tacx neo 2t test
Reviews & Ratings
19:53The reviewer purchased the GEOID PM500 Power Meter Crankset for around €140 out of curiosity due to its low price. He tested it against a Favero Assioma power meter and found that while it provides usable power data, especially for longer intervals, it has accuracy issues in short sprints. The unit he received initially broke down, but he received a replacement. He notes that it is a rebranded version of the Magene P515, sharing the same module, and concludes that it is a good value for entry-level cyclists, though it has some limitations.
08:30The reviewer discusses the GEOID PM500 cycling power meter as an affordable entry-level option for cyclists who want consistent and reliable power data. They highlight its compatibility with Shimano 105 11-speed systems, lightweight design, long battery life, and accuracy of ±1.5%. The reviewer emphasizes that at $179, it provides meaningful data without the need for expensive alternatives.
14:42The reviewer tests the GEOID PM500 cycling power meter, which comes with cranks. They compare it to a cheaper spider-based power meter (Leico) and find the GEOID PM500 to be more accurate and reliable, especially after high-power sprints. The reviewer recommends the GEOID PM500 for its accuracy and value, noting it is a good option for those who need a power meter on a budget.
08:01The reviewer purchased the GEOID PM500 power meter set from AliExpress for about £165. It is a crank set with a direct mount spider power meter, not including a chainring. The reviewer finds it affordable, easy to install, and aesthetically pleasing. They tested it and confirmed it pairs with devices and provides power readings.
The GEOID PM500 cycling power meter is a budget-friendly option that appears to be a rebranded Magene P505 or P515 spider-based power meter. User tests show accuracy comparable to Garmin Rally pedals and direct drive trainers, but some concerns exist about potential offset shifts after high-power efforts, though not confirmed for this model. It is heavier than standard cranksets but offers good value for a second bike.
AI Summary
Pros
- Accuracy close to Garmin Rally pedals and direct drive trainers
- Significantly cheaper than Magene P515 (about 2/3 the price)
- Compatible with Shimano 4-bolt 110BCD cranksets
more pros in the review
Cons
- Heavier (680g) compared to standard 105 crank (545g)
- Potential offset shift after sprints (not confirmed for this model but seen in similar cheap meters)
- Limited long-term reliability data
Key Points
- Spider-based power meter, 4-bolt 110BCD, 24mm spindle
- Rebranded Magene P505 or P515
- Weight: 680g
more key points in the review
A Reddit user tested the Geoid PM500 power meter against a Tacx Neo 2T trainer and found it tracks well overall, with no offset issues after high-power efforts. It appears more responsive than the trainer but showed some cadence drops and a power drop without cadence change. Installation is straightforward, similar to Shimano cranks. However, a commenter noted the power scaling feature does not work, which is a drawback for users needing calibration.
AI Summary
Pros
- Tracks Tacx Neo 2T accurately overall
- No offset problems after 1000+ watt efforts
- More responsive to sudden power increases than the trainer
more pros in the review
Cons
- Power scaling (slope adjustment) does not work, confirmed by support
- Some cadence drops observed (possibly glitches)
- One unexplained power drop without cadence change
Key Points
- Spider-based power meter, 4-bolt 110BCD, 24mm spindle
- Compatible with Shimano direct drive (MTB) interface
- Tested against Tacx Neo 2T with 2-second offset and 1-second smoothing
more key points in the review
The GEOID PM500 is a spider-based power meter with 4-bolt 110BCD 24mm interface, widely discussed as a rebranded or similar version of the Magene P505/P515. Users report it's typically priced between $170-$250, with weights around 668-680g including cranks. It uses a proprietary crank interface (paired with Senicx PR3 cranks) that is not compatible with other crank arms. The Senicx PR3 arms are more outward curved than Magene PES505, offering better front derailleur clearance, but the chainline is about 3mm shorter, which may cause chainstay clearance issues in some 2x setups. The power meter features ANT+/Bluetooth connectivity, claims ±1.5% accuracy, and works with Magene app and major cycling computers. User experiences on accuracy are mixed: some report good correlation after calibration, while others see -2-3% deviation vs smart trainers or encounter calibration difficulties with certain devices (Coros Dura, older Garmin). Some units have experienced a complete failure showing 0W while cadence still works; a possible fix is calibrating with a different head unit (e.g., iGPSport i830). No app activation is required, which is a plus over some Magene products. It is widely used in 1x setups. Overall, it is considered a budget-friendly alternative to Magene's offerings, often 2/3 the price in China, and a good value if performance is acceptable.
AI Summary
Pros
- Good value for money compared to similar power meters like Magene P515
- Compatible with major cycling apps and computers (Garmin, Wahoo, Magene, etc.) via ANT+/Bluetooth
- Uses improved 4-bolt clamping system compared to Magene's single-bolt design
more pros in the review
Cons
- Heavier than comparable models (approximately 680g vs 625g for Magene P515)
- Proprietary crank interface limits compatibility with other crank arms
- Potential chainring compatibility issues requiring shims
more cons in the review
Key Points
- Price range: $170-$250 (often ~$171 on Amazon, ~1000 RMB in China)
- Weight: 668-680g with cranks
- Accuracy: ±1.5% claimed, some users report -2-3% vs trainer
more key points in the review
Where to Buy
GEOID PM500 Bike Power Meter Crankset | ±1.5% Accuracy
GEOID PM500 Bike Power Meter Crankset | ±1.5% Accuracy
GEOID Crankarm PM500 Bike Power Meter 4Bolt 110BCD 24mm Spindle Cadence Bicycle Spider-based Power Meter for Shimano
GEOID PM500 Bike Power Meter 4-Bolt 110 BCD 24mm Spindle Cadence Bicycle Crankarm for Shimano ±1.5% Accuracy 300h Battery Life
GEOID PM500 Road Bike Power Meter 110BCD 4-Bolt Crank ANT+ Bluetooth 24mm Spindle Compatible with Shimano
GEOID PM500 Cycling Bike Spider-Based Power Meter 4Bolt 110BCD 24mm Spindle Bicycle Crankarm for Shimano
GEOID PM500 Leistungsmesser für Rennräder - Kurbelsatz Leichtbau 680g mit Präzision ±1,5%, Akku 300 Stunden, 110 BCD, Bluetooth/ANT+, IPX7 Wasserdicht
Specifications
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