GT Avalanche Comp Bicycle Black. GT Avalanche Comp Mountain Bike is a complete hardtail for mountain bikers featuring an all-new, high-end 6061 T6 aluminum frame featuring the GT Triple Triangle that lends stiffness to the rear of the bike, each tube of the Avalanche Comp it's been hydroformed to reduce weight, while the tapered head tube keeps the front end in precise tracking. An updated 1x10 drivetrain from Shimano provides a wide gear range that allows you to tackle any climb you may encounter while on your mountain bike. Shimano hydraulic disc brakes give you confidence in stopping power in all weather conditions. 27.5-inch wheels provide nimble handling on rough terrain. The SR Suntour XCM-DS fork provides 100mm of plush suspension travel for a much smoother ride with plenty of room to play. A hydraulic lockout feature is included to provide a more efficient ride on softer tracks.