Ride over rough terrain with ease on the Mongoose Impasse HD. The Impasse HD features an aluminum mountain-style frame with internal cable routing provides a durable, trail-ready ride. This bike comes equipped with 21 speeds for adaptability, while the front and rear disc brakes provide extra stopping power. The threadless headset delivers crisp steering and the aluminum 3-piece crankset offers superior performance without a ton of pesky maintenance. Plus, the extra-large 29 x 2.35-inch tires give you the extra grip and stability you need to take on difficult trails. Rough terrain is no obstacle when you're on an Impasse HD. There's nothing you can't do on a Mongoose.