Well, I have a medium trance x. Tall headtube, yes, but no taller than an 18″ orange 5 with a headset. I run mine with 150 revelations and a 3mm offset bush. Rides ok on dh tracks, but brilliantly on UK singletrack. Love the bike, only problems I see are the not so good rear tyre clearance (not at sides, but height) and the funny shock size (although there are now after market shocks avail in this size) .