How long can you last on your mountain bike?
The nation's top endurance riders will find out the answer to that question this month as they compete in the USA Cycling 24-Hour Mountain Bike National Championships, Sept. 29, in Colorado Springs, Colo.
Will you be there? You can race solo or as part of a team, and online registration is open now until 11:59 p.m. EDT on September 23.
Onsite registration will also be available, and the fees are: $205 for a solo racer, $320 for a duo, $520 for a four-person team, and $360 for a four-person junior team.