Quote:
Originally Posted by *Touring Ted*
I think wind screens are a simple science. If its quieter when its on then its... Errrr , quieter.
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But many are not quieter, regardless of height. IMO, it's not simple at all as the human factor has to be worked into it.
Quote:
Originally Posted by *Touring Ted*
Duck down to your tank and hear the difference.
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Ducking down or laying flat on the tank will make any bike quiet ... or even a noisy helmet. But you can't ride down there!
Try this test Ted ... ride normally at about 70 mph behind your screen of choice and gauge the noise level. Now stand UP ... getting above the screen. Result? For me, for most bikes with screens, standing is quieter than riding behind the screen. Try it out.
Your body may be dry and protected but you can still have lots of noisy buffeting with a screen. Buffeting can make you deaf over time.
(dangerous sub audible frequencies at work)
Quote:
Originally Posted by *Touring Ted*
I test rise a lot of BMWs with big electric adjustable screens. You can literally turn noise on and off with the switch and it usually is with a couple of inches in height.
Screens work... Bigger the better. Even if they look lame 
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Electric screens do give lots more adjustment ... and some can be fine tuned for quiet for some ... but not all riders. But certainly a great option!
I've tested them too ... and every brand, not just BMW. The Kawi Concours 14 is a pretty good one.
In my experience, most sport touring/ADV bikes with fixed screens have been noisy. Also, many aftermarket screens are no better. Of course different sized riders may get different results. Some big barn door screens can push you in the back, a kind of back pressure I guess? ... weird feeling. Pretty quiet but weird! :confused1: An old Guzzi SP1000 I rode years ago did this. The last Guzzi I rode, the Norge, was really noisy for me. The Griso was quiet, but very low.
On my personal bikes I've had mixed results. Took a few tries to get a quiet shield on my DL1000. Finally hit it and it wasn't bad. GREAT in rain. BAD in heat. (less air flow)
On my 1050 Tiger I tried four different screens, including one that was a UK product, multi-adjustable rig. Quite clever ... but never worked for me. Turns out that was true for about half the buyers on the UK Tiger owners forum ... most sold them off or sent them back.
Also tried:
Givi tall and short screen, Triumph tall touring screen, stock screen. Finally went with a very short sport screen which provided little protection but at least was quiet. Some riders hit the mark and got that Tiger quiet ... but it's tricky depending on rider size, shape and posture on the bike.
You can read volumes of posts about screens and wind noise on forums for many bikes ... including BMW GS's, RT's and others. The Vstrom crowd (thousands of riders) went round on screens for 4 years and NEVER found one that worked for everyone. I considered myself lucky to find one that worked!