Full-suspension bikes usually come with a hefty price tag, though, and tend to require extensive maintenance. Wheel size There are three wheel sizes when it comes to mountain bikes: 26 inches, 27. ...

Best Beginner-Friendly Bike: Mongoose Switchback; Smoothest Shifting: ... while a full-suspension bike has both front and rear shock-absorbing ... Hiland 26 27.5-Inch Mountain Bike. $310 at Amazon.