Each kart has its own stats. Generally, karts are better than bikes because outward drift is superior to inward drift. Due to the high speed of heavy characters, it's better to choose a kart focusing on acceleration like the Biddybuggy or Mr. Scooty. However, the Wild Wiggler kart is also really good because of the added speed.

Wheels and Gliders

Every wheel and glider also has its own stats. The undisputed best wheels in MK8D are the Rollers and Azure Rollers. This is because of their unmatched acceleration, handling, and mini-turbo(for drifts). Gliders don't matter much, but the best ones are the Cloud, Paper, Flower, and Parachute.