Greater Chicago Combine consists of 4 different clubs. North Side Concourse, South Side Concourse, West Side Concourse, and Oak Lawn. This is one of the biggest combines in the United States. Membership is around 180. Chicago has some of the best handlers in the US and is very very competitive. Old bird racing starts at 100 miles and goes up to 500 miles. Young bird races start at 100 miles and go up to 350 miles. Both old bird and young bird series consists of 10 races.