There are a few different bikes that can hold 350 lbs, but the one that is most recommended is the Schwinn IC3. This bike has a steel frame and fork, which makes it durable and able to handle more weight than other bikes. It also has a wide seat and an adjustable stem, so you can be comfortable while riding. Additionally, the IC3 has 20-inch wheels and 28 gears, making it easy to ride on different terrain.