I believe the tires are 700cX28. They are slicks. My Kenda Kwest has more tread pattern than the stock tire of that Schwinn. It's equivalent here in Canada is called the Schwinn Circuit XST. Lots of good reviews. From what I read, this little bike is quite the speedster. Weighs around 26lbs. I think for the price, it is certainly one of the better dept. store bike. I think it comes only in one size (atleast the one here) which is 18" frame.