By the way, and I wish I'd thought about this when I had my frame/fork built, the more rake you have then the quicker the bike will feel...so even though the wheelbase grows a bit with more rake, the trail decreases and, all other things being equal, the bike will feel more nimble. If your present fork is 38mm and you move to a 40, you'll prob notice little difference...but move to a 45 from 38 and I'm sure it would be night & day. So if you like nimble, get more rake - if you like stable, get less rake.