Kart Racing Classes, Explained

A 7-year-old should not race a 40-year-old. A 100-pound driver should not have to beat a 200-pound driver on raw weight. And a nine-horsepower four-stroke cannot fairly race a 90-mph shifter kart. Classes exist to make racing fair.

A class is simply a group of drivers matched closely enough that the racing comes down to skill. Get the matching right and every race is a tight pack of evenly paired karts. That is the whole reason the racing at a good track is so close.

The first split is age. It runs from Kid Karts at age 5, through Cadet and Mini classes for roughly ages 7 to 12, into Junior classes around 12 to 16, and up to Senior classes for 15 and older. There is even a Masters class for drivers 35 and up.

Age grouping keeps young drivers racing peers at a similar stage, and it is the backbone of the karting ladder, the structure a driver climbs as they grow.

Within an age group, classes are split by weight, because a lighter kart-and-driver package accelerates harder. To keep it fair, every class sets a minimum combined weight. A lighter driver adds ballast, weight bolted to the kart, to meet the minimum.

That is why you will see a Senior 206 Medium and a Senior 206 Heavy. Same engine, same age group, different weight minimums, so drivers race others carrying a similar package.

The last split is the engine. A class runs one specified engine, so nobody has a horsepower advantage. The four-stroke 206 classes race 206 karts. The KA100 classes race KA100s. Shifter races shifter.

Music City Kartplex runs 19 classes in the Rhythm & Race Championship Series across exactly these three splits. To see every class, the ages, the weights, and which one fits a particular driver, the Class Explorer does the matching for you.