The GEOID PM500 is a budget-friendly spider-based power meter, often considered a rebranded Magene P505/P515, offering good accuracy for the price but with proprietary crank interface and heavier weight.
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
- Tracks Tacx Neo 2T accurately overall
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
- Power scaling (slope adjustment) does not work, confirmed by support
Key Facts
- Price range: $180-$250
- Weight: 668-680g with cranks
- Accuracy: ±1.5%
Reviews & Ratings
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
- Easy to install and use
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
- Compatible with Shimano cranks
- User tested against Tacx Neo 2T and Garmin Rally pedals
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
- Easy installation, similar to Shimano cranks
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
- No fumble after high-power efforts (common pitfall in other affordable meters)
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 $180-$250, with weights around 668-680g including cranks. It uses a proprietary crank interface (similar to but not compatible with Easton/SRAM standards) paired with Senicx PR3 cranks, features ANT+/Bluetooth connectivity, and claims ±1.5% accuracy. The product is seen as a budget-friendly alternative to Magene's offerings, with compatibility with Magene apps and major cycling computers.
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
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
Key Points
- Price range: $180-$250
- Weight: 668-680g with cranks
- Accuracy: ±1.5%
- Crank interface: Proprietary (similar to Magene P505)
- Compatibility: ANT+/Bluetooth, works with Magene app
- Cranks: Senicx PR3 with 4-bolt 110BCD
Where to Buy
GEOID PM500 Cycling Bike Spider-Based Power Meter 4Bolt 110BCD 24mm Spindle Bicycle Crankarm for Shimano
Questions about GEOID PM500 Cycling Bike Spider-Based Power Meter 4Bolt 110BCD 24mm Spindle Bicycle Crankarm for Shimano
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