Sunny Health & Fitness Magnetic Belt Drive Indoor Cycling Bike with 44 lb Flywheel and Large Device Holder - SF-B1805

The Sunny SF-B1805 is a magnetic belt-drive indoor cycling bike built for riders who want a quiet, steady ride at home. It pairs a heavy flywheel with a seat and handlebars that both adjust, so most riders can dial in a proper fit. It is a home-use bike, so read the warranty limit below before you buy.

Decision facts for the Sunny SF-B1805:

How Magnetic Resistance Works on a Bike

Magnetic resistance slows the flywheel with a magnetic field instead of a brake pad. Sunny says the closer the magnet sits to the flywheel, the more resistance you feel at the pedals.

What is the difference between magnetic and friction resistance? A friction bike presses a pad against the flywheel, and that pad wears down over time. A magnetic bike uses a field instead, so nothing rubs against the wheel. Sunny describes this bike as nearly silent and virtually maintenance free, and you change the level with a simple twist. If you are still comparing styles, browse more exercise bikes.

Key Features of the SF-B1805

This bike gives a home rider a heavy flywheel, an adjustable fit and the basics for a long ride.

• Heavy flywheel for a smooth, stable pedal stroke
• Four-way adjustable seat and handlebars
• Toe-cage pedals with adjustable straps
• Emergency stop brake that halts the flywheel
• Device holder between the handlebars
• Water bottle holder and transport wheels

SF-B1805 Specifications

Fit, frame and warranty decide how this bike lives in your home. More bikes from the same maker sit on the Sunny Health & Fitness brand page.

Sunny's warranty policy excludes labor, assembly and shipping costs.

Who Should Buy It and Who Should Skip It

Buy it if you want a quiet home bike with a heavy flywheel and a flexible fit.

Best for:

• Home riders who want a quiet pedal stroke
• Riders who fall inside the listed inseam range
• Households that follow workouts on a tablet or phone

Not a fit if:

• You plan to use it in a commercial gym or a shared apartment, condo or HOA facility
• You weigh more than the listed user limit
• You need a built-in performance display

This bike is for home use only, and commercial or shared-facility use voids Sunny's warranty.

The listing does not state a performance display or Bluetooth, so plan to follow your ride on a phone or tablet in the device holder. Call 423-458-2453 for a delivery quote to your address before you add the bike to your cart.

Need a bike for a gym or studio? See our commercial exercise bikes.

Pick Your Sunny Indoor Cycling Bike

Here is how the SF-B1805 compares with two other Sunny indoor cycling bikes on our site. It sits in the middle on flywheel weight and on user limit.

Pick the SF-B1002 for the heaviest flywheel, the Evolution Pro II for the highest rider weight, and the SF-B1805 for a balance of both.

Returns and Cancellations

You can return equipment within 30 days of purchase if it is working, undamaged and in its original packaging. A 25% restocking fee applies, and you pay the shipping cost to send it back. Cancel before the order ships and a 2.5% fee applies. The full terms sit on our shipping and returns page.

SF-B1805 FAQs

What rider size fits the SF-B1805?

The SF-B1805 fits riders with a 28 to 38 in inseam, and the seat sits 17 to 21 in from the handlebars. The seat and handlebars both adjust, so most riders inside those ranges can find a comfortable position.

Can I use the SF-B1805 in a gym?

No. It is a home-use bike. Sunny's warranty says commercial use, including commercial gyms and shared facilities in apartments, condos and residential associations, voids it.

Order the Sunny SF-B1805

Ready to add a quiet, heavy-flywheel bike to your home gym? Add the SF-B1805 to your cart today. Hamilton Home Fitness ships from Tennessee to all 50 states.