What for wheels do I need for slalom?

Slalom: Split durometer; hard in front soft in the back (not necessary)

For slalom, you want to consider the concrete discipline, you want bigger wheels around 75mm for longer courses, and giant slalom, and smaller wheels around 66mm for faster, more tight courses. You will always want a square-lipped wheel, with a sharp edge, that is flexible. This will hold traction, and return the energy you’ll put into turns.

The hard wheel in front is usually around 80a-83a and is there to increase roll speed. Soft wheels in the back are around 77a-80a and are softer, so they will provide more grip.

(You will also want to run split angles on your trucks.)

Seismic DefCon, Cuei Killers and other Sharp Edged wheels will work great.