Micro sprints use solid axles front and rear. We noticed that while some cars used coil springs, many cars still use torsion springs. Talking to a few teams, this primarily comes down to cost: Torsion spring cars are slightly older and cheaper. Coil springs offer more tuning options. Both types of car made it into the A-Main so traction can be found with either design.Some front axles have removable steering arms. I believe this allows for changes in steering travel and Ackerman.We also noticed that none of the cars have brakes on the right front wheel. This pulls the car left under braking. These cars only ever need to turn left at speed and the brakes are primarily used right before cornering so this helps the car rotate with no steering input. This also simplifies and lightens the car: nothing is left for turning right! Pun intended.From what we could tell, all of the cars were using torsion bars for the rear axle. We saw all sorts of linkage and mounting options, including this design with the damper mounted to the endlink of the torsion bar.Cooling is provided by an aluminum radiator mounted in the nose. The exact location varied depending on the car. Some cars mounted the radiator high. This not only protects the radiator from damage, but can be necessary due to packaging reasons. This particular car had a recirculating steering system and torsion springs and trying to mount the radiator low would be difficult.
