This document reviews 9 of the best mountain bikes for men. They are summarized as follows: 1. The Royce Union Men's Gravel Bike which has an aluminum frame, Neco alloy crank, and dual Shimano disc brakes. 2. The Royce Union 27.5 inch All-Terrain Mountain Bike which has a Shimano drivetrain, rear derailleur, and removable back derailleur guard. 3. The Mongoose Dolomite Men's Mountain Bike which has a Shimano rear derailleur, twist shifters, and alloy rims.