My tires, as so far they've always been, are Kenda Kwicks. They came stock with the bike, haven't tried others. They're 30c, and do well enough for me on and off the road. I've never noticed them to be "slow". When I went touring back in August, I kept a good pace on the road. I just don't want to go with slicks, as I never really know how a ride will go until I go. It is the main reason I love riding my cyclocross bike or freedom bike as it seems to really be, simply for the avenues of riding it opens up. I think mostly of Back To The Future - Roads? Where we are going we don't need roads!