4iiii
4iiii Precision 3+
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Best Cycling Power Meters · head-to-head
4iiii Precision 3+ vs Stages Power LR Shimano Ultegra R8100
A sourced, side-by-side comparison. Stages Power LR Shimano Ultegra R8100 is cheaper at $889.99. Every spec and price links to its source.
Stages
Stages Power LR Shimano Ultegra R8100
$889.99
Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec |  4iiii Precision 3+ |  Stages Power LR Shimano Ultegra R8100 |
|---|---|---|
| US price | — | $889.99 |
| Brand | 4iiii | Stages |
| Released | — | — |
| Mount type | crank-arm | crank-arm |
| Measurement sides | single-sided | dual-sided |
| Accuracy (%) | 1 | 1.5 |
| Weight grams | 9 | 15 |
| Battery type | CR2032 | CR2032 |
| Battery life (hr) | 800 | 175 |
| Connectivity | ANT+/BLE | ANT+/BLE |
| Power balance measured | No | Yes |
| Cycling dynamics | Yes | — |
| Waterproof rating | IPX7 | IPX7 |
| Warranty years | 3 | — |
Sources — 4iiii Precision 3+: 4iiii.com (verified 2026-07-13). Stages Power LR Shimano Ultegra R8100: stagescycling.com (verified 2026-09-17).
What's the difference between the 4iiii Precision 3+ and Stages Power LR Shimano Ultegra R8100?
Where the two actually differ on the specs we track (5 of 11). Matching specs are omitted.
- Measurement sides: 4iiii Precision 3+ single-sided vs Stages Power LR Shimano Ultegra R8100 dual-sided
- Accuracy (%): 4iiii Precision 3+ 1 vs Stages Power LR Shimano Ultegra R8100 1.5
- Weight grams: 4iiii Precision 3+ 9 vs Stages Power LR Shimano Ultegra R8100 15
- Battery life (hr): 4iiii Precision 3+ 800 vs Stages Power LR Shimano Ultegra R8100 175
- Power balance measured: 4iiii Precision 3+ false vs Stages Power LR Shimano Ultegra R8100 true