The Greenbrier Challenge starts Sunday morning, April 21, 2013, at 8:00 AM on with the opening of registration. Registration then closes for each race 30-minutes prior to its start time with the last registration closing at 1:30 PM (Cat 1 Pro and Expert Race). Make sure you know which class you plan on racing in and if your class — in the case of all Expert riders — requires your to have a USA Cycling MTB license to compete! Just in case you were wondering, Marathon, Beginner, Junior, Sport, Single Speed or Clydesdale classes do not need a license to compete! Race day events will also include mechanical support by or main sponsor The Bike Lane, Food Concessions, and even hot showers and changing rooms available.Read more in the Race Day >> Schedule section!