GT Avalanche 1.0 Disc features: GT Triple Triangle design 6061 butted aluminum with pressure formed downtube, zero stack headtube. Disc compatible with removeable der. Hanger, RockShock J3 Fork with 100 mm tavel, magnesium lowers with preload adjust, with lock out. Truvativ 5-D Cranks with Shimano Deore/LX 27 speed drivetrain, Couble wall rims on shimano disc hubs, Tioga Factory Extreme Front and Factory XC rear 26 x 1.95 Hayes Sole Hydraulic Disc brakes, zero stack headset, riser handlebar.