TNT Tuesday Night Thunder Race Series is a weeknight criterium bike series in Louisville, Colorado, with racing every Tuesday starting in June. Riders race repeated laps on a short closed course rather than a point-to-point route, so the action stays compact and easy to follow. The series is self-categorized and unsanctioned, with a stated aim of keeping local bike racing affordable and fun. Women and juniors race free, and the organizer, Sanitas Sports, frames the series around community and access for people who ride bikes.
The TNT course is 0.6 miles per lap, with 27 feet of climbing each time around. It uses three wide 90-degree turns, then a long, gradual uphill bend that carries riders into the start/finish line. That layout makes it beginner-friendly without making it dull: riders still have to handle corners, positioning, and repeated efforts on the rise. Race numbers go on the rider’s right side, a small but practical detail for scoring and officials on the course.