I had these Conti tires (20 x 1.125) put on my new Bike Friday and they road like they had lumps in them! I took them off and checked my wheels to make sure they were true and properly dished and everything was fine.

I then put on some Schwalbe Stelvio K tires and they road as smooth as glass! So, I'm wondering if the Conti tires are defective or if they are just crappy tires.

Anyone have any experience with Conti Grand Prix tires? If so, what did you think of them?