Tucson

Epic Rides (www.epicrides.com)

Mountain Bike Tucson Meet-Up (www.meetup.com/Mountain-Bike-Tucson)

Pima Trails Association ( www.pimatrails.org)

Sonoran Desert Mountain Bicyclists (www.sdmb.org)

Tucson Cycling (www.aliciarides.com)

Tucson MTB.com (www.tucsonmtb.com)

Way Out West Bed & Breakfast  (http://www.wowtnt.com/host.htm )

Arizona

AZ State Land Department -  Recreational Permit (www..land.state.az.us)

Arizona Trail Association (www.aztrail.org)

Mountain Bike Association of Arizona (www.mbaa.net)

Mountain Bike AZ.Com  (http://mtbikeaz.com/)

Raven Singletrack of Prescott (www.ravensingletrack.com)

Scottsdale Mountain Bikers (www.meetup.com/mtbike/)

National

International Mountain Bike Association - IMBA (www.imba.com)

Mountain Bike Review (www.mtbr.com)