The frame is an 18" 2002 Iron Horse "Vice" The reason I got a new frame is because my original one cracked, and it had a lifetime warranty. The guy in the warranty dept. tried to tell me that none of my old parts/components would fit, and wanted to give me $150 off a new, entry-level trail bike. I was insulted since the frame that cracked was their (at the time) top of the line XC bike... $2300 new. I told them "no thanks", and opted to take my chances on the comparable frame. I got it and everything fits fine... except I wasn't possitive on the headset. <br /><br />Since my post, I've looked up the new frames specs, and it's stocked with a 1 and 1/8" headset... which is what I have!!!! That guy was either joshing me into buying a new bike, or just doesn't know what he's talking about. They make a great bike... this new frame is very nice, and I plan to test it out HOPEFULLY this weekend. <br /><br />So to answer my own question, the headtube will be significantly larger than the stearing tube to accomodate the headset.<br /><br />Thanks!