Hours: Mon-Fri: 9am-6pm, Sat 9am-5pm, 4021 Mockingbird Ln Amarillo, TX 79109 MAP (806)355-7224 hills@hillssport.com
A few area events. 

May 30-31, 2015 24 Hours in the Canyon  
June 21-22, 2015 Bike MS: Valero Ride the Rim
August 28-30 Hotter'n Hell Hundred (Wichita Falls)

Links to other event info sites:
Old Tascosa Cycling (Local info)
West TX Cycling (Lubbock)
Texas Bicycle Racing Assoc
Texas MTB Racing Association
West Texas MTB series
Oklahoma Earthbike (MTB info)
BRAOK (OK road racing)
New Mexico Cycling
USA Cycling (national)
Union Cycliste Internationale (global)