Photo gallery: US cross country national championship course preview

The US Mountain Bike National Championships are happening this weekend in Sun Valley, Idaho. Racing got underway on Thursday with category 2/3 cross country events for riders of all ages. On Friday morning, the Under 23 and junior women will kick off their racing, followed by the Under 23 and junior men. Elite cross country races will happen on Saturday, and the short track and super D are on for Sunday for all categories.

Sue George is an editor at Cyclingnews.  She coordinates all of the site's mountain bike race coverage and assists with the road, 'cross and track coverage.