DENVER (CBS4) – Organizers behind the Sports Authority Rock ‘n’ Roll Denver Marathon & ½ Marathon are offering a unique chance this fall for cyclists in Denver to ride around the streets of the city without any traffic.

The marathon is offering a new bike tour on the morning of the race — Saturday, Sept. 22 — after the roads have been closed off to cars.

The Rock ‘n’ Roll Denver Bike Tour will take cyclists on 22 miles of the closed marathon course. It starts from Civic Center Park about a half hour before runners begin their race and there will be entertainment on the sides of the roads.

Riders are to follow a specific set of rules during the ride, including maintaining speeds of above 10 mph. The event is also not a race — riders are not to exceed 20 mph. No tandem bikes are allowed, and neither are fixed-gear bikes.

Registration is currently open for the bike tour. The entry fee is $60, and that includes a T-shirt and a free beer (for those of legal age) at the finish line.

The Sports Authority Rock ‘n’ Roll Denver Marathon & ½ Marathon benefits the Prostate Cancer Foundation.

LINKS: Rock ‘n’ Roll Denver Bike Tour | Sports Authority Rock ‘n’ Roll Denver Marathon & 1/2 Marathon