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Magene P505-S1103 SRAM Road Power Meter

Niel Ubod May 19, 2024


Accurate, affordable, dual-sided power for your SRAM 3-bolt road crankset!

Only 2 left in stock

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Magene P505-S1103 SRAM Road Power Meter

The Magene P505-S1103 SRAM Road Power Meter is a spider-based power meter that is compatible with SRAM 3-Bolt cranksets. The Magene power meter measures power from both legs, is +/- 1.0% accurate and features automatic calibration. Weighing only 110 grams and utilizing a rechargeable battery, the Magene P505 is a power meter that is feature rich and allows you to add power to your crankset without changing crank arms or bottom brackets.

The Magene P505 also features a 200-hour ride time, pedal smoothing, IPX7 water and dust proofing, an app for calibration and 2-year manufacturer’s warranty. It can connect with ANT+ or Bluetooth which allows you to use your favorite indoor training program or app.


Key Product Details


The Magene P505 SRAM Power Meter is compatible with SRAM 3-bolt cranksets. This includes the SRAM S-900, Force 1, Force 22, Rival 1, Rival 22 and CX1. Regarding chainrings, it fits 110 BCD 5-bolt and 110 BCD 4-bolt chainrings. See Compatibility tab for more information.

Power Measurement:

The Magene P505 measures power at the spider and is therefore able to measure power from both legs. It also measures left and right power balance, cadence and pedal smoothing.

Key Features:

Dual-leg power measurement that is accurate to +/- 1.0%, 200 hours of battery life, rechargeable battery, 110 grams, ANT+ and Bluetooth compatibility, auto-zero (automatic calibration). See Specs tab for more information.

Advice From Our Staff:

The Magene P505 is a great way to add dual-sided power to SRAM 3-bolt road cranksets. It is one of our most affordable power meter spiders and since it bolts on to your existing crankset, there is no need to buy new cranks or change bottom brackets. We recommend this to cyclists who would like to learn more and enhance their ride with additional data.


Other Versions to Consider

Magene P505 SRAM 8-Bolt: If your SRAM crankset utilizes the 8-bolt interface, we also have the Magene P505-S1108 SRAM 8-Bolt Road Power Meter. It is also compatible with both 110×4 BCD and 110×5 BCD Chainrings.


Cranksets: The Magene P505-S1103 SRAM Power Meter is compatible with SRAM S-900, Force 1, Force 22, Rival 1, Rival 22 and CX1 cranks with a 3-bolt interface.

Chainrings: This power meter is compatible with 110 BCD 5-bolt or 110 BCD 4-bolt chainrings. In many cases, you can use your existing chainrings assuming they use the same configuration as the power meter you order.

  • Note 1 - Please note, the 110 BCD 4-Bolt version is compatible with all Shimano 4-bolt chainrings, including Ultegra 8100 and DURA-ACE 9200 chainrings.
  • Note 2 - Some SRAM cranksets come equipped with direct mount chainrings. In this case, you will need to purchase new chainrings as direct mount chainrings won't work with a power meter spider. We have several chainrings to choose from on our Chainrings page.
  • Note 3 - This power meter is not compatible with SRAM Red cranksets as these use a 1-piece drive-side crank arm and spider.

What is BCD?: BCD (bolt circle diameter) is simply the diameter of a circle that passes through the centers of the bolt holes in your chainring. The BCD is usually stamped right on the chainring as either 110 or 130. It is important to know what BCD your crankset is because assuming you want to use your existing chainrings on your new power meter, you need to order the correct BCD.

Image of a chainring explaining the concept of BCD

Magene P505-S1103 SRAM Road Specs

NameMagene P505 SRAM Road
Bike TypeRoad
Location of Power MeasurementSpider
Left or Both Legs MeasuredBoth
Independent Left/Right MeasurementYes - Power Balance
InstallationMore involved (60 min. estimated)
Communication ProtocolANT+ and Bluetooth SMART
Claimed Accuracy+/- 1.0%
Weight110 grams
Battery TypeRechargeable
Battery Life200 hours
Method of Cadence MeasurementAccelerometer
Warranty2 years

In the Box

  • Magene power meter
  • Charging cable
  • User's manual

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