US Pro Ultra Endurance Series adds fifth round

A racer in the Spa City six-hour mountain bike race.

A racer in the Spa City six-hour mountain bike race. (Image credit: Fred Phillips)

USA Cycling added a fifth event to its US Pro Ultra Endurance Tour (US Pro UET) for 2011. The US Cup Six-Hour Sunset Challenge will close out the debut year of the endurance series with overall champions crowned at the end of the six-hour event running from 3:00 to 9:00 pm on Saturday, August 27 in Fontana, California.