The Spec tires are really good! I have been running them for 3 weeks now and the center rib is just now starting to wear off! This past week i was only about .5 sec off of 17.5TC times. I ran the Mcallister Riley body which to be honest has a lot of push, ultimately it went fast but i had to add a bunch of drag brake and change the roll centers to get it to turn. I noticed the same thing on asphalt with a mod setup. It really does look good on the track though! I painted up a S2k that i have had sitting on my shelf for about a year, came out pretty good!