Hi!
I got the tires on and I changed to a 14 sprocket and I can tell a difference for sure. I didn't take my GPS so i don't know the actual difference in speed, but it seems slower. I don't really need to be going 60 anyway.
With the banshee wheels/tires and a 13 I almost hit 60 mph.
I can tell you that the ITP holeshot's make a world of difference. In the gravel I used to get going about 10 and turn hard and nail the gas to end up going the other way and with these itp's it bites and I got tossed on my ass, LOL the bike was standing straight up on it's grab bar.
I wish someone had taped it. I felt like I must have looked like a total jackass. LOL