StagesBike SB20
A smart bike with a crank-based power meter, a 22.6 kg flywheel and standard FTMS and FE-C control.
Cadexa takeRiders have reported this bike working with the Cadexa app over FTMS. Not yet reproduced by the Cadexa team; see the compatibility checker.
- Trainer type
- smart-bike
- Maximum resistance
- 2200 W
- Maximum simulated gradient
- 25%
- Claimed power accuracy
- ±1.5%
6 functions reported working with the Cadexa app by riders; not reproduced by the team yet.
About the StagesBike SB20
The SB20 is a complete indoor bike rather than a trainer: no road bike is mounted, resistance is built in, gearing is virtual and shifted from buttons, and power is measured at the cranks. It speaks Bluetooth FTMS and ANT+ FE-C, so apps control it the same way they control a trainer.
Stages Cycling went through insolvency in 2024 and was acquired by Giant in 2025; the brand returned at Eurobike 2025, reopened SB20 support and manufactured spare parts, and launched the lighter SB200 in October 2026. Retailers now list the SB20 as sold out, so treat it as a used-market or clearance purchase and check firmware through the Stages app.
Specifications
Manufacturer claims with their sources. Where Cadexa has measured a value it appears in its own column. Missing values are shown as unknown. Manufacturer page
| Specification | Manufacturer claim | Source |
|---|---|---|
| Overview | ||
| Trainer type | smart-bike | Press / reviewsmartbiketrainers.com Checked 3 Nov 2026 |
| Performance | ||
| Maximum resistanceHighest power the trainer can resist, as claimed by the manufacturer, often at a stated speed. | 2200 W | Press / reviewsmartbiketrainers.com Checked 3 Nov 2026 |
| Maximum simulated gradient | 25% | Press / reviewsmartbiketrainers.com Checked 3 Nov 2026 |
| Claimed power accuracyManufacturer claim. Independent measurements, when we have them, are shown separately. | ±1.5% | Press / reviewsmartbiketrainers.com Checked 3 Nov 2026 |
| Power measurementHow power is measured: strain gauge, optical, or estimated from resistance. | crank-based power meter (coin-cell batteries) | Press / reviewthe5krunner.com Checked 3 Nov 2026 |
| Flywheel mass | 22.6 kg | Press / reviewsmartbiketrainers.com Checked 3 Nov 2026 |
| Control | ||
| Virtual shifting | Yes | Press / reviewsmartbiketrainers.com Checked 3 Nov 2026 |
| Descent simulation (motor-driven) | No | Press / reviewsmartbiketrainers.com Checked 3 Nov 2026 |
| Connectivity | ||
| Bluetooth FTMSThe open Bluetooth Fitness Machine Service. Required for trainer control by the Cadexa app. | Yes | Press / reviewsmartbiketrainers.com Checked 3 Nov 2026 |
| ANT+ FE-CANT+ trainer control, used by Garmin and Wahoo head units and many desktop apps. | Yes | Press / reviewsmartbiketrainers.com Checked 3 Nov 2026 |
| Concurrent Bluetooth connections | 2 | Press / reviewsmartbiketrainers.com Checked 3 Nov 2026 |
| Experience | ||
| Calibration | Recommended; auto calibration available | Press / reviewsmartbiketrainers.com Checked 3 Nov 2026 |
| Physical | ||
| Maximum rider weight | 136 kg | Press / reviewsmartbiketrainers.com Checked 3 Nov 2026 |
| Weight | 57 kg | Press / reviewthe5krunner.com Checked 3 Nov 2026 |
| Other | ||
| Crank Lengths (mm) | 165, 170, 172.5 or 175 | Press / reviewsmartbiketrainers.com Checked 3 Nov 2026 |
| Saddle Height Range | 52 to 85.5 cm | Press / reviewsmartbiketrainers.com Checked 3 Nov 2026 |
| Q Factor (mm) | 157 | Press / reviewsmartbiketrainers.com Checked 3 Nov 2026 |
| Virtual Groupset | Programmable: Shimano, Campagnolo, custom | Press / reviewsmartbiketrainers.com Checked 3 Nov 2026 |
Cadexa coverage
Guide
Cadexa on a smart bike: a reader-confirmed Stages SB20 and Polar H10 setup
No road bike, no cassette, nothing to clamp. A Cadexa rider reports that the StagesBike SB20 and a Polar H10 work out of the box over Bluetooth. Here is what that setup is, how it pairs, and what to know about the SB20 in 2026.
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