Sunny Health & Fitness Magnetic Exercise Bike 44 lb Flywheel
- Magnetic resistance, belt drive
- 44 lb flywheel
- 300 lb (135 kg) maximum user weight
- 4-way adjustable seat, adjustable handlebars
- Optional SunnyFit app over Bluetooth
- 121 centimeters minimum user height
- Battery powered console
Last refreshed Jun 30, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A belt-driven magnetic indoor cycling bike with a heavy flywheel, a device holder and an optional app connection. The listing gives no resistance level count or pedal type.
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ASIN: B09R5QRVWGModel: SF-B1805SMARTCategory: Exercise Bikes
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Overview
A magnetic resistance system works against a belt-driven flywheel, giving a smooth, nearly silent ride at home. The seat and handlebars adjust, a device holder carries a tablet or phone, and an optional app tracks workouts.
A heavy flywheel, magnetic resistance and a high user weight rating make it a sturdy home bike for steady cardio and intervals. The limits are the missing resistance level count, pedal and console details, and an app that is optional.
Who it's for
Home cyclists doing steady rides, intervals or app-guided classes, including heavier riders within the rating, fit the product. Buyers wanting a large built-in display, or full detail on pedals and resistance steps, should check the specs first.
Pros and cons
- Quiet magnetic resistance
- High user weight rating
- Four-way adjustable seat
- Resistance level count not listed
- Pedal type not listed
- App connection is optional
Performance notes
Magnets sit near the flywheel and change resistance without touching it, so there is no friction pad to wear and the ride stays quiet. A heavy flywheel stores momentum, which smooths out the pedal stroke and helps interval pushes. A belt drive transfers power with less noise than a chain.
Specifications
| Brand | Sunny Health & Fitness |
|---|---|
| Model | SF-B1805SMART |
| Dimensions & fit | |
| Maximum Weight Recommendation | 135 Kilogramslower than 69% of 56 exercise bikes |
| Minimum Height | 121 Centimeterslower than 66% of 39 exercise bikes |
| Item weight | 56.6 Kilograms |
| Item Dimensions D x W x H | 50.8"D x 23.4"W x 47.6"H |
| Flywheel weight | 44 lbs |
| Power & efficiency | |
| Power Source | Battery Powered |
| Construction & materials | |
| Material | Alloy Steel |
| Color | Grey |
| Other details | |
| Resistance Mechanism | Magnetic |
| Drive System | Belt |
Closest rivals on specs
Schwinn Recumbent Exercise Bike- Minimum Height 47.6 vs 54 inches (-12%)
Frequently asked questions
How big is the Sunny Health & Fitness SF-B1805SMART bike?
It measures 50.8 inches deep, 23.4 inches wide and 47.6 inches high, and weighs 56.6 kilograms.
Does the SF-B1805SMART need the SunnyFit app?
No. The app connection is optional and runs over Bluetooth for tracking and classes.
Is the SF-B1805SMART a spin bike with a chain?
No. The drive system is a belt and the resistance is magnetic.