Big O Tires- Longmont Share: Auto Repair & Service Big O Tires- Longmont Visit Website 1205 S Main St. Longmont, CO 80501 303-772-1462 www.bigotires.com/Location/CO/Longmont/80501/006125 About Map About Big O Tires offers diagnostic, repair, and routine maintenance services. What's Nearby? Distance: 5 10 15 20 25 50 mi.