Stages
Stages Power LR Shimano Ultegra R8100
$864.99
Best Cycling Power Meters · head-to-head
Stages Power LR Shimano Ultegra R8100 vs Magene P505
A sourced, side-by-side comparison. Magene P505 is cheaper at $349. Every spec and price links to its source.
Magene
Magene P505
$349Cheaper
Which is better: the Stages Power LR Shimano Ultegra R8100 or Magene P505?
On the specs we track, they're closely matched. The Magene P505 is the cheaper at $349.
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Stages Power LR Shimano Ultegra R8100 | Magene P505 |
|---|---|---|
| US price | $864.99 | $349 |
| Brand | Stages | Magene |
| Released | — | — |
| Mount type | crank-arm | spider |
| Measurement sides | dual-sided | — |
| Accuracy pct | 1.5 | 1 |
| Weight grams | 15 | — |
| Battery type | CR2032 | rechargeable-liion |
| Battery life hrs | 175 | 200 |
| Connectivity | ANT+/BLE | ANT+/BLE |
| Power balance measured | Yes | No |
| Cycling dynamics | — | No |
| Waterproof rating | IPX7 | IPX7 |
| Warranty years | — | 2 |
Sources — Stages Power LR Shimano Ultegra R8100: stagescycling.com (verified 2026-07-13). Magene P505: magene.com (verified 2026-07-13).
What's the difference between the Stages Power LR Shimano Ultegra R8100 and Magene P505?
Where the two actually differ on the specs we track (5 of 11). Matching specs are omitted.
- Mount type: Stages Power LR Shimano Ultegra R8100 crank-arm vs Magene P505 spider
- Accuracy pct: Stages Power LR Shimano Ultegra R8100 1.5 vs Magene P505 1
- Battery type: Stages Power LR Shimano Ultegra R8100 CR2032 vs Magene P505 rechargeable-liion
- Battery life hrs: Stages Power LR Shimano Ultegra R8100 175 vs Magene P505 200
- Power balance measured: Stages Power LR Shimano Ultegra R8100 true vs Magene P505 false