The USA Cycling Mountain Biking Championships that were held last year in downtown Roanoke, at Carvins Cove and at Explore Park, are back again next month for a week of racing beginning July 12. During an event at Elmwood Park this morning that revealed the six courses competitors will tackle next month – both time trials and long distance runs on Mountain Bike Trails – it was announced that the USA Cycling Mountain Biking Championships will ret…