I have used nothing that heavy in the center before, but have considered it when our local track gets slick. I have always played with different combinations from this 5k 10k 3k, I have 5k in the rear to match the front after the weekend and did not have any issues with it. I have also been told that any ratio close to the 5k, 10k, 3k will be a good starting point. Most of my friends with X-Rays, (The luxury buggy). LOL, are running 7k 7k 7k, and they are about the quickest and best handling, at my local track. You just have to get what is comfortable for you and your driving style. With the Mayhem, I have had the most luck with these combinations mentioned above. There is a gentlemen on this forum by the name of Rockman who has had some helpful answers and solutions for myself, when it comes to this particular buggy. Perhaps he can add to this, Good Luck.