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The reviewer extensively discusses the Magene Power Meter PES P505 Base, highlighting its performance, compatibility, and value. They note that it sits just below the p505 spider bass power meter in terms of technical specifications but closely matches it with a claimed accuracy of plus or minus 1.5 percent. The reviewer praises its easy installation for Shimano Road group sets, 24mm Shimano compatible spindle, and the inclusion of a crankset with five different lengths. They also mention its wireless connectivity (ANT+ and Bluetooth), power, cadence, balance, and pedal smoothness metrics. The reviewer tested it over two months and found the data to be very good, exceeding expectations for a budget power meter. They highlight its price and 24mm spindle as killer features, making it a great option for first-time power meter users or those looking for an affordable upgrade.
AI-Summary
Pros
- Cheap and accurate
- Shimano Road group set compatible
- Easy swap out and swap in for Shimano users
- 24mm Shimano compatible spindle
- Comes with a crankset in five different lengths
- Wireless connectivity (ANT+ and Bluetooth)
- Provides power, cadence, balance, and pedal smoothness metrics
- Good battery life (up to 200 hours)
- IPX7 waterproofing
- Active temperature compensation
- USB rechargeable internal battery
- Firmware upgrades via Magene app
- Good performance both indoors and outdoors
- Exceeded expectations for a budget power meter
- Great value for money
Cons
- Cadence readings can be a bit spiky
- Does not ship with chainrings (must be purchased separately)
Key Points
- Claimed accuracy of plus or minus 1.5 percent
- 4 bolt 110 BCD
- 24mm Shimano compatible spindle
- Five crank lengths available (165mm to 175mm)
- Q factor of 147mm
- Wireless connectivity (ANT+ and Bluetooth)
- USB rechargeable battery
- IPX7 waterproofing
- Active temperature compensation
- Power scaling adjustable by plus or minus 10%
- Weight depends on crank length (reviewer's setup was 782 grams with 172.5mm crank and Shimano ring setup)
The reviewer extensively discusses the Magene Power Meter PES P505 Base 4 Bolt 110 BCD 24mm Cadence Pedal Balance Ant Steel Spindle Crankset Chainring for Shimano Sram throughout the video. They highlight its compatibility with Shimano bottom brackets, 110 BCD chainrings, and 24mm spindle, making it a direct replacement for Shimano cranks. The reviewer emphasizes its value at $300 (with a discount bringing it down to $270), its 1.5% accuracy rating, and its performance compared to higher-end power meters like the Favero Assioma pedals. They also note its IP67 waterproof rating, ANT+ and Bluetooth compatibility, and the inclusion of cadence data. The reviewer tested it against Favero Assioma pedals and found the power readings to be very close, especially when the head unit was positioned correctly.
AI-Summary
Pros
- Compatible with Shimano bottom brackets and chainrings
- 110 BCD and 24mm spindle for easy installation
- Affordable at $300 (discount to $270 available)
- 1.5% accuracy rating, comparable to industry standards
- IP67 waterproof rating
- ANT+ and Bluetooth compatibility
- Includes cadence data
- Lightweight (635g for the set)
- Good power balance estimation (49/51)
- Works with existing Shimano chainrings
- Q factor of 146mm, close to Shimano's 147mm
- Available in various crank lengths (165mm, 170mm, 172.5mm, 175mm)
- Good performance in real-world tests against Favero Assioma pedals
Cons
- Not a true dual-sided power meter (estimates left/right power balance)
- Initial power readings were skewed when the head unit was in a jersey pocket
- Requires calibration via the Magene app
- Chain rub noticed during installation (though easily adjustable)
Key Points
- 24mm spindle compatible with Shimano bottom brackets
- 110 BCD for use with Shimano chainrings
- 1.5% accuracy rating
- IP67 waterproof
- ANT+ and Bluetooth compatible
- Includes cadence data
- Q factor of 146mm
- Weighs 635g for the set
- Available in 165mm, 170mm, 172.5mm, and 175mm crank lengths
- Requires calibration via Magene app
- Max wattage reading of 2500 watts
The reviewer discusses their experience with the Magene PES P505 power meter over several months, highlighting its reliability, affordability, and features. They compare it to higher-end models and other power meters, noting its consistent performance in various conditions.
AI-Summary
Pros
- Rock solid reliability
- Affordable at $300
- Compatible with Shimano bottom brackets
- Measures both power and cadence
- Broadcasts ANT+ and Bluetooth
- 1.5% accuracy in power measurement
- Provides left-right power balance and pedal smoothness
- Features automatic calibration and active temperature compensation
- Rechargeable battery lasting up to 200 hours
- IPX7 waterproof
- Available in five different crank lengths
- Option to buy with a chainring for an extra $74
- Easy installation
- Consistent performance in various weather conditions
- Competes with more expensive models
Cons
- Does not provide true left-side power measurement (estimated)
- Slightly less accurate (1.5%) compared to the higher-end QED 505 (1%)
Key Points
- 24mm spindle compatible with Shimano bottom brackets
- Measures power with 1.5% accuracy
- Broadcasts ANT+ and Bluetooth
- Provides left-right power balance and pedal smoothness
- Automatic calibration and active temperature compensation
- Rechargeable battery (200 hours)
- IPX7 waterproof
- Crank lengths: 165mm to 175mm
- Q factor: 147mm
- Weight: 782g with 172mm crank arm
- Requires activation via Magene Utility app
The 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
The Magene PES P505 is a budget-friendly spider-based power meter, often praised for its accuracy and value. Users report typical prices around $200-300 USD, with weights around 638g for the spider/crank combo (no chainrings). It uses a 24mm steel spindle compatible with Shimano bottom brackets, but has compatibility issues with T47 internal and BB386 bottom brackets due to spider clearance. The power meter requires specific chainrings (110 BCD for the P505 Base version) and uses a proprietary interface that locks it to Magene cranks unless purchasing the separate spider-only version (P505-S1103). Accuracy is generally good after calibration, though some units require power scaling adjustments. Common issues include left crank arm loosening (addressed with a redesigned preload bolt), occasional creaking, and firmware update problems.
AI-Generated Forum Summary
Pros
- Excellent value for money, often priced around $200-300 USD
- Accurate power readings when properly calibrated, comparable to Favero Assioma and smart trainers
- Easy installation for Shimano-compatible setups with straightforward setup process
- Good battery life with easy charging via proprietary cable
- Spider-based design provides dual-sided power estimation (L/R balance)
Cons
- Left crank arm preload bolt frequently works loose, requiring threadlocker or replacement with redesigned bolt
- Not compatible with T47 internal and BB386 bottom brackets due to spider clearance issues with some frames
- Proprietary interface locks P505 Base version to Magene cranks only, cannot be used with other cranksets
- Firmware updates can cause issues requiring magnet reset procedure
- Some units require power scaling adjustments (typically 101-105%) for accurate readings
- Occasional creaking noises from crank/power meter interface
- App interface described as "janky" with occasional connectivity issues
Key Points
- Price typically $200-300 USD during sales (11.11 discounts available)
- Weight: Spider 112g, total system ~638g without chainrings
- 24mm steel spindle compatible with Shimano bottom brackets
- Requires 110 BCD chainrings (4 or 5 bolt)
- Power scaling feature in app allows calibration adjustments
- Magnet reset procedure available for unresponsive units
- Separate P505-S1103 spider version works with 3-bolt cranksets
- New preload bolt design addresses loosening issues
Frequently Asked Questions
Is the Magene P505 compatible with T47 bottom brackets?
Officially not compatible with T47 internal bottom brackets due to spider clearance issues, but some users report success with spacers or specific frame designs. T47 external may work better.
Can I use the P505 Base power meter with other cranksets?
No, the P505 Base version has a proprietary interface that only works with Magene cranks. The separate P505-S1103 spider version works with 3-bolt cranksets.
What chainrings are compatible with the P505?
Requires 110 BCD chainrings (4 or 5 bolt). Popular options include Shimano, Pass Quest, Stone, and ZRace chainrings. For 2x setups, both chainrings must be 110 BCD.
How do I fix the left crank arm coming loose?
Use threadlocker on the preload bolt, ensure proper torque (10-12Nm), or obtain the redesigned two-piece preload bolt from Magene or sellers.
How accurate is the power meter compared to other devices?
Generally accurate within 1-2% when properly calibrated, though some units require power scaling adjustments (typically 101-105%). Compare with a trusted baseline device.
What should I do if the power meter stops working or won't calibrate?
Try the magnet reset procedure: connect charger, hold magnet above flashing red light until it blinks. This often resolves firmware issues.
Can I use oval chainrings with the P505?
Not recommended. Spider power meters tend to overestimate power with oval chainrings, though some users adjust via power scaling for single-ring setups.
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