16-LEVEL MAGNETIC RESISTANCE FOR ULTIMATE WORKOUT CONTROL: Take your workout to the next level with our bike's 16-level magnetic resistance system! Equipped with four high-grade magnets and a 6.6-pound aluminum-rimmed flywheel, this indoor bike provides seamless and whisper-quiet resistance adjustments. Whether you're just starting out or a seasoned athlete, you can easily find the ideal challenge to push your limits. PRE-ASSEMBLED 70% & SAVING 30% INSTALLATION TIME: The portable exercise bike you get is almost 70% assembled.You only need to install the mainframe, handlebars, monitor, pedals, seat and bike feet as well as very few screws. The entire process takes less than an hour. Clear instructions and videos make assembly effortless for anyone. It enables you to enjoy a riding experience faster.