Their job is to change tires and fuel up race cars in minutes and even seconds.
Trackhouse Racing was part of the 2023 winning team.
Kenyatta Houston, Jonathan Willard and Brendan Foley joined ABC7 Chicago to talk about how they got involved.
They said it's important to be in shape because they handle heavy equipment. Tires can weigh about 50 pounds and a large gas can weighs about 100 pounds.
2024 NASCAR Chicago Street Race guide: Start time, where to watch, how to get here, tickets and more
Pit crews are prepared for NASCAR Chicago Street Race 2024
The NASCAR race is happening on July 6 and 7 in Grant Park.
FESTIVALS: 2024 NASCAR Chicago Street Race weekend schedule, live concerts and festival information
General admission starts at $269 dollars.
The Chainsmokers, Keith Urban and Buddy Guy are the headlines for the festival.
STREET CLOSURES: Chicago NASCAR race course route map, street closures, parking restrictions