the plan (at the moment, still gathering information and planning) is to build a 2wd, so with 4 i would have one spare for each.

or, with shipping not that expansive, but not much money to spend at once maybe just 2 first, get a prototype working, and buy spares before first fight. I'm quiet aware it's destructive and not a cheap hobby, but i can spend money only gradually, not all at once. so i need some calculating on what's the best way to do this^^