My bike (Husaberg FS400e) came setup from the factory with the 17" motard wheels. The front is 3.5" while the rear is a 4.25". (tire sizes are 120/60x17 front 150 or 160/60x17 rear). I believe you can buy the whole motard kit from husaberg as an aftermarket add on.
As for the series, it's a whole lot of fun. Like you, I am not a big jump guy, but the biggest jump we have is 3' high. The jumps are usually setup just after a corner so you don't have a ton of speed before hitting them, just enough to get the bike off the ground.