The rear axle
Alternatively, you can also try to ensure more grip with optimized concentricity without reducing the limit area even further. This can be done very easily by using Ortmann tires which are trued in our patented RSM tire grinding machine. The result is a flat tire and therefore optimal grip. We definitely recommend this.
If the axle unit is replaced with a Slot.it axle with aluminum rims, the wheels are just as round as with a ground standard axle, but it is significantly more expensive. The only advantage of a slot.it axle over a standard axle with ground tires is the smaller play of the axle in the bearing and a high-quality axle gear. It's difficult to say how much this lower axle play adds up to lap time and always depends on the layout and driving style, but it is quite low considering the costs. Conditionally recommended.