I am still riding a 2006 Stumpjumper Expert. These tires, which I just put on about a week ago, are labelled 2.35 rather than 2.3 and are about the largest tires I can put on the bike and still clear the rear seatstays. In fact, the occasional pebble gets momentarily caught in the stays! These seem significantly larger in circumference and girth than my old 26 x 2.3 Ground Control tires, which were pretty long in the tooth. So they slow the steering quickness slightly, all else being equal. It is getting pretty hard to find decent 26 inch tires since the industry has gone to 29 and 27.5, so I am happy to have found these. So far, so good. Thanks, Specialized!