Description : Geax AKA 29 Mountain Tire. The popular Geax AKA mountain bike tire is now available for your 29er. Known for its outstanding performance on dry and compact terrain, the AKA dishes out aggressive grip on rocks, sand, gravel and grass--without sacrificing low rolling resistance. The key is in its uniquely shaped knobs, which penetrate the ground without digging in. Sounds like a paradox, but one ride will convince you that the AKA is AOK.