I was recently asked by a friend about front tyres. I've got a Michelin on, but its DOT approved and quite stiff. He's got a Pirelli MT32 which is not DOT approved (I dont think).
It seems that all the DOT ones are very stiff. The Pirelli MT18 for example is also quite a stiff tyre.
What brand of tyre do you use? Vote here. If you have a favorite tyre, let us know by adding a comment.
There has been a little discussion on this before see here