I have tried the 13 in and the 15 in, I am 6ft 4in with a 34 inch inseam and no matter that height or angle I am getting my head beat off. I wear a full face helmet and as far as I can tell the wind in coming from the sides and not over the top. Has anyone else experienced that? and how did you fix it? It seems the windshield is not wide enough to deflect the wind away.