www.tuolumnecountytrails.com–The Tuolumne County Transportation Council trails site with mapping and links to trails in the area.
www.walkandbikecalaveras.org–Active transportation for Calaveras County by the Calaveras County Council of Governments
Golden Chain Cyclists–Tuolumne and Calaveras cyclists’ club
JT Cycles, 55 S. Washington St. Sonora
Sonora Cyclery, 13867 Mono Way, Sonora
Mountain Pedaler, 352 S. Main St. Angels Camp
Velo Promo–Regional and local race organization and promotion
TopSport Cycling–Regional and local race organization and promotion
Popular Mid-Central Valley Bicycle Routes–A good collection of road routes in the mid and lower foothills.
http://stanislaustour.com/locations.html–Has information and photos for common destinations in the Stanislaus National Forest.
http://www.calaverasoutside.org–Information and mapping of trails in Calaveras County. Not all about bikes.
Amgen Tour of California, Sonora–Stage 4 starts in Sonora on May 16, 2012.