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Sunny Health & Fitness
Sunny Health & Fitness

Sunny Health & Fitness SF-B1805 Magnetic Belt Drive Cycle

4.1 / 5 editorial rating

A heavy-flywheel magnetic belt-drive indoor cycle built for a quiet, smooth ride with a sturdy commercial-style frame.

$449 MSRP · ref. Jun 2, 2026
Check price at Sunny Health & Fitness →

MSRP is a reference figure — live price is on the retailer's site.

Overview

The Sunny SF-B1805 is a step up from Sunny's entry cycles, built around a heavy 40-pound flywheel and a quiet magnetic resistance system that together deliver a smooth, momentum-rich ride well above its price point. The belt drive runs almost silently, making it a good choice for apartments or shared spaces where a chain-driven bike would be intrusive, and the micro-adjustable resistance knob lets you fine-tune intensity precisely or brake the flywheel quickly. A reinforced steel frame with a wide, triangular base keeps the bike planted during hard out-of-the-saddle efforts, and leveling feet handle uneven floors. The seat and handlebars adjust four ways to dial in fit, and the caged pedals with adjustable straps keep regular shoes secure. A simple device holder positions a phone or tablet so you can stream your own classes, though there is no console or connectivity built in. Transport wheels make repositioning easy despite the heavy flywheel. The lack of any monitor or app integration is the main limitation, but for riders who supply their own device and want a quiet, stable, smooth-riding cycle at a fair price, the SF-B1805 delivers strong value.

Pros

  • +Heavy 40-pound flywheel for a smooth ride
  • +Near-silent magnetic belt drive
  • +Sturdy wide-base steel frame with leveling feet
  • +Four-way adjustable seat and handlebars

Cons

  • No console or connectivity
  • Caged pedals only, no clip-in option
  • Heavy flywheel makes the bike weighty to lift

Full specifications

Exercise Bikes specs

Bike type Indoor Cycle
Resistance Magnetic
Flywheel 40 lb
Console Device holder, no built-in console
Connectivity None
Adjustable seat Yes
Foldable No
Max user weight 300 lb

Dimensions & weight

Dimensions (L×W×H) 49" × 20" × 46"
Floor footprint 6.8 sq ft
Product weight 112 lb

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