Depends on the weather and distance for me. I use the stock 4" in town at 5'8", in the summer traveling a day or two I use a 6" LRS dark ultra or maybe a klock werks 6.5 depending on what I feel like. Longer trips, cold or wet weather and the 9" LRS goes on. I still easily see over the 9" and with cold or wet temps or if I'm riding far enough where I might run into them than style is out and its all about comfort for me.
im 6 1 and i had a 4 inch straight windshield. Worthless. Like not having any windshield. Went to a 8 in klockwerks. Huge difference. Hat never flies off and i can smoke a cigar while riding if i want to not that i do but u get the point. I hate getting smashed in the face non stop by giant bugs. thats not fun
At 6'2" 10" HD light smoke touring shield. I didn't like looking thru the curve on the windsplitter when I first stated out, but am going with one in the spring.