gravelcyclist.com
Dirty Donut - Martin, Michigan (2019-06-09)
From the Promoter: Gravel road bicycle race with something for everyone, from the casual rider to hardcore gravel grinders! 3 distances available: 18, 40 or 64 miles. Eat donuts to shave minutes off your time (5 minutes per donut), or crank it out without donuts for the Sprint Division! Great