Emerson Stone created a number of illustrations to be used on the National Bike Challenge website. After a ton of experimenting with different ways to portray skin tone a final design was chosen. The characters have a standardized face, body shape, and clothing type but vary in skin tone, age, and style which gives the characters a uniform look while allowing them to be diverse and unique. These simple and colorful characters tastefully portray race in a present yet subtle way. This allows for a fun and accurate representation of a mixed group of people united by the love of all things biking.
You can find more of these characters, as well as a corresponding set of icons done for the National Bike Challenge, on their website.