I can tell you my experience. I'm 6'2" and like to look over. I ordered a 17 smoke and it was too tall and too dark. Sent it back and got a 13 clear. The lower price for the 13 was almost enough to take care of shipping. Then I put a RDL seat on that raised me 2 1/4 inches, the 13 still worked fine but thought a 15 might be better. Ordered a 15 clear and had it custom cut for 2 inches wider also. It is better but still the 13 would have worked for me. If you are 6'1" on a stock seat a 13 is prob good for you also. The Masstad is so well designed you can look well over without a problem. Good luck.