It not pretty but it works

[the Ferret]

That is just a rule of thumb, not a rule lol. Nothing wrong with looking thru a shield or a million Goldwing owners would be laying in ditches someplace.

Conventional wisdom says you should be able to see a spot on the road 50 feet in front of the bike when looking over the windshield in a normal riding position. Like I said not a hard fast rule. depends on how much or how little air you like hitting you, if you can stand buffeting and flag flapping wind noise, or just clean air noise.

I think aftermarket windshields are probably the number 1 farkle for all bikes, right in front of aftermarket seats. I know guys that have bought and sold 1/2 dozen windshields of various heights, widths and curvatures for their bikes and still aren't happy.