Dec 23, 2021 · 1200+ hours spent reviewing. The Keiser M3 Indoor Cycle is a gym-quality spin bike. It provides infinite, incremental, smooth magnetic resistance, controlled with a computer for convenience and precision. Other highlights include wireless heart rate monitoring, Shimano Combo pedals, and wheels for easy transport. This spin bike bundle includes the Keiser M3i Indoor Cycle Bike, a floor mat, media tray, stretch pads and a heart monitor, which makes it a great all-in-one set. Everything sets up quickly and. Best exercise bikes and smart bikes for the ultimate indoor cycling. Powertrain RX-600 Exercise Spin Bike Cardio Cycle - Red. $449. Don#x27;t Pay. $ 559. The Keiser M3i is the industry’s only indoor group cycling bike built entirely around YOU – that’s YOU the rider, YOU the gym owner, and YOU the service technician. Game-changing features on the M3i include: V-shape frame to match riders of.