Sunny Health & Fitness Smart Upright Exercise Bike SF-B220045
- Maximum Weight Recommendation: 275 pounds
- Resistance Mechanism: Magnetic
- Drive System: Belt
- Power Source: Battery
Last refreshed Jun 30, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A quiet, easy to assemble upright bike that works well for steady casual cardio, with a seat most riders will want to upgrade. Solid if you want app connected metrics without spending on a bigger flywheel.
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ASIN: B09R3X55YBModel: SF-B220045Category: Exercise Bikes
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Overview
An upright stationary exercise bike with a 9 lb magnetic flywheel, 4-way adjustable seat and Bluetooth connection to the SunnyFit app for live workout metrics.
This bike sits in Sunny's smart-connected line, meaning the value add is the SunnyFit app pairing with live stats and workout videos rather than a heavier flywheel or motorized resistance.
- 9 lb magnetic flywheel
- 4-way adjustable seat
- Bluetooth SunnyFit app connection
- Contactless magnetic resistance
Who it's for
Home riders wanting a quiet, magnetic resistance upright bike for casual daily cardio, including smaller riders who reported it fit better than taller competing bikes. Not for anyone expecting high impact or heavy interval training, which one reviewer flagged it is not built for.
Pros and cons
- Straightforward assembly most riders finished in about an hour
- Works well for shorter riders who could not reach handlebars or pedals on other bikes
- Stock seat drew repeated comfort complaints
- One reviewer had a pedal snap off the crank after about a month
- Not designed for high impact training
Performance notes
Magnetic resistance keeps the ride contactless and quiet compared to felt pad bikes, and the 9 lb flywheel builds enough momentum for a smooth pedal stroke at casual paces. The SunnyFit app pairs over Bluetooth to show live speed, distance and other metrics, and offers guided video workouts, though it is a companion feature rather than a built in screen.
Specifications
| Brand | Sunny Health & Fitness |
|---|---|
| Model | SF-B220045 |
| Dimensions & fit | |
| Maximum Weight Recommendation | 275 poundslower than 76% of 51 exercise bikes |
| Power & efficiency | |
| Power Source | Battery |
| Construction & materials | |
| Material | Alloy Steel |
| Other details | |
| Resistance Mechanism | Magnetic |
| Drive System | Belt |
| Part Number | SF-B220045 |
| Recommended Uses For Product | Indoor |
| Special Features | Adjustable Resistance Level |
Closest rivals on specs
Frequently asked questions
Does it work for smaller riders?
Yes, one reviewer at 5 foot 1 inch found it the first bike where handlebars and pedals both fit properly.