What the heck is a Speed-tune™? Glad you asked. Historically, carpet cars used a flat spring known as a T-plate to support the rear of the car. The material used to do this is usually fiberglass. The plate attaches to the rear axle and runs up the mid-section of the chassis. With this, and some simple adjusting screws, the cars cross weight, or tweak, is set and adjusted. The problem with this setup is consistency. As the car is run, the T-plate will fatigue, and the screws will be jarred loose. The second, and perhaps more prevalent problem, is that the T-Plate takes up a lot of the room in the car. Finally, the T-Bar itself is always acting as a ride height spring. This limits the actual shock springs you can viably use. No matter what you do or how you set up a T-bar car, a bump or ripple in the track surface is always transferred through your chassis before it ever reaches the dampening of your shock/spring. The Speed-tune™ system is very different. It uses very simple and reliable set of metal coil springs and damper tubes for tweak control, strong side links, a center pivot ball and an oil filled shock. The Speed-tune™ system is arranged in a way that allows easy tweak adjustment via two large screws. The adjustment screws are placed towards the outside of the chassis over the link ends which gives the springs much more leverage for doing their work. It also gives you much finer adjustment increments in the tweak control. There are several different tweak and shock springs available for any track conditions. The unique linkage arrangement also allows the battery to be placed in the very middle of the car giving it a very low "polar moment of inertia". This makes the car change direction very quickly.