| The 21st Annual Calvin's Challenge, the best 12-hour bicycle race in the USA! How many miles can you ride? The route consists of a 50 mile loop and a 7 mile loop, both flat to rolling. Drafting and aerobars are allowed in the 6 and 12 hour events; however, no drafting in the TT. Helmets are required. Bike or helmet mounted mirrors are also required. |
