If you consider it for a Hybrid Wheel System beyblade, where TAKARA-TOMY used the 'handles' on the Track to place it directly onto the Metal Wheel (the 'handles' act as a vertical limit upwards, in a way), then the lowest Track you can get that could still be attached to a Bottom is probably only 90. With the previous system, we might be able to get slightly lower, 75, but the Wheel would really hit the stadium floor anyway. Plus, TAKARA-TOMY does not seem to be interested in the previous system anymore ...
The Bottom itself easily requires a 50 on its own, and then you need some height to be able to put a Track under the Wheel.
The Bottom itself easily requires a 50 on its own, and then you need some height to be able to put a Track under the Wheel.