Look at the brand, price and type. Many differences. According to the types, there are mainly: rear wheel resistance type, direct drive type, roller type and indoor exercise bike. Brands and prices, such as seven or eight thousand imported wahoo, four thousand domestic intelligent riding for three generations, the noise is relatively lower than one; Some people with thousands of dollars can't even stand their own families. Not to mention neighbors. In short, you get what you pay for. There are many articles about riding platforms on the Internet.