I learned about vehicle from the same tutorial and I had the same problem and to be honest,I don't remember how I actually fixed it but here is what you have to do.
Go to http://forums.epicgames.com/threads/...1#post29420021 and follow this tutorial closely and I bet that you won't have the same problem again.
From what I know is because of the wheel size.
Let us know if this worked,and if not,we'll find a way to fix it .Good luck.
Dude, thank you.
I follow the tutorial and everything worked.
The problem is COMoffSet