The MXC wheel is a forged mag wheel that will keep the tires in the optimum operating temperature better. This allows the kart remain much more consistent over the course of the run, as the tire doesn’t overheat and cause handling issues.
Douglas makes wheels that are supposed to do the same thing, with their SE model wheels. I’ve tested a lot of wheels back-to-back and the MXC gives the best feel. It is the most consistent, versatile, and best at keeping the tire from overheating. I’ve used the MXCs with success on cold tracks with hard tires, as well as hot tracks with soft tires.
The SE does the same thing, just not quite as well. They don’t feel as stiff as the MXCs.
The MXPs are going to be more similar to standard Douglas mag wheels. They’re fine wheels, you just will find that in high-grip situations, the MXC is going to help you out a lot.
I just order a set of Douglas SEs from Fastech. $90 for a pair of 130 fronts, $100 for a pair of 212 rears. I paid $220 shipped from CA to GA. What a deal. I’ve seen sets on other sites for $275 and up.