After-Sales Service: 100% Brand New Quality Service. If You Have Any Questions, Please Contact Us Within 24 Hours! Customer Satisfaction is Our Greatest Reward. Large Flywheel and Large Diameter: the Solid Flywheel Brings Smoother and More Effective Riding Experience. Adjustable Resistance: According to the Big Data of Cycling, Multiple Positions Are Designed, 360° Stepless Speed Change, Multiple Options to Meet Different Exercise Intensity.