Frame: Lightweight and high-performance steel or aluminum alloy hardtail frame. Drivetrain: 21-speed transmission system (usually a 3x7 speed setup using affordable components like Shimano Tourney/TZ derailleur and EF-51 shifter). Brakes: Mechanical front and rear disc brakes. Suspension: Front suspension fork with about 100mm of travel. Wheels: 26-inch double-wall alloy rims and 26" x 1.95" multi-terrain tires.