Founded in 2004, Twenty4 Sports inc. is one of the largest promoters of mountain bike racing in
North America. Twenty4 Sports inc. is a privately owned company. Available to novices and professional athletes alike, 24 Hours of Adrenalin is a massive relay, where teams of up to ten people compete to ride as many laps as possible in a 24-hour time frame. Twenty4 Sports inc.
plans to host ten races this year.

24 Hours of Adrenalin is a mountain bike event series in North America. In 2005, over 10,000 enthusiasts participated, earning 24 Hours of Adrenalin the title of "fastest growing mountain bike event series in North America". It revolves around a massive relay race, where solo riders or teams
of up to ten people compete to ride as many laps as possible in 24 hours, though participants are only required to complete one lap. The race generally favors speed over technical skill and begins with a 600 metre dash to retrieve bikes. In addition to placings, awards are presented for Best Theme and Best Helmet. First place winners in each category receive a jersey and medal, while other finalists receive prizes donated by sponsors.

The 24 hours of Adrenalin website allows riders to sign up for events and pay the registration fee online. The site also contains information pertinent to the races, camping etc.