'93 K75S Tall Windshield

[rocketbrick]

Hey gang!

I've researched a bunch of threads here and can't seem to find a definitive answer for a tall windshield on the K75s. I'm 6'1 and I get bashed in the face by the wind, but can't get down low enough to really mitigate it. I won't be selling this and getting an RT, as it belonged to an Uncle and is sentimental.

I want to get the Gustafsson 19in windshield in stock width. What's the general consensus on them?

[The Mighty Gryphon]

What is annoying you is the turbulent spill off the top of the windshield.  I'm 6'1" and had put a taller Aeroflow shield on my K75S and found that it only raised the impact point of the turbulence a couple inches higher on my helmet, about right on the visor.

After a bunch of experimentation what I found to be the best solution was to get an old stock windshield and cut it down about 4 inches.  That put the turbulence down on my chest greatly reducing the noise and buffeting on my helmet because it was now in a clean airstream.   I also had a K75RT with the same problem, and I did the same thing cutting it's shield down which not only reduced the buffeting but also made the bike a little bit cooler to ride in hot weather. 


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[natalena]

The Aeroflow is 19.5". I'm 5'10" and it puts the air above my helmet for the most part.
I would try a strap-ons laminar lip first, on the existing screen.
K75 mounting plastic expanding plugs are wear items that'll fling a tall windscreen into your lap.
Cheers

[natalena]

Opps, meant "clip" not strap- on, which would be all floppy and distracting.

[Chaos]

I liked the Aeroflow but I'm only 5'9'.  Those square nylon license plate nuts are good replacements for the original BMW ones.  I learned that after the Parabellum in my profile pic blew off on I-70 and got run over by a semi.

[rocketbrick]

All great ideas and insight, thanks folks!

Gryphon, I have two stock windshields so I can cut one down and try that out. Side note - which auxiliary lights did you install on the front of your bike?

In the meantime, I’ll look into those nylon license plate nuts recommended.

Thanks for the help so far everyone!

[frankenduck]

The Laminar Lip for the K75S is worthless. I do not recommend. (Not all Laminar Lips are bad though. I have the K75C one and it does work OK.

Aeroflow is the way to go if you want the best wind protection on a K75S. (I'm 6-2 and still prefer the stock windscreen.

Aeroflow:

[Laitch]

After a bunch of experimentation what I found to be the best solution was to get an old stock windshield and cut it down about 4 inches. That put the turbulence down on my chest greatly reducing the noise and buffeting on my helmet because it was now in a clean airstream. 

This could be a good place to discuss your technique of cutting down a windscreen, Mighty Gryphon. Some readers might get the impression it's as simple as using a guillotine.

[Laitch]

Aeroflow is the way to go if you want the best wind protection on a K75S. (I'm 6-2 and still prefer the stock windscreen.

Here's an update concerning Aeroflow by a BMW MOA member last December that indicates a used or NOS Aeroflow is now the option.

• Dec 19, 2024

      I stopped by the Aeroflow address this morning
 What’s occupying their space is an Orkin pest control
 There’s no Aeroflow signage anywhere on the building nor any we moved to another location sign
 I think it’s safe to assume that at this time there’s no more Aeroflow.

[daveson]

I won't be selling this and getting an RT, as it belonged to an Uncle and is sentimental.

Another option is to buy just the top part of an RT fairing. I've seen an RT converted to a naked but the front piece was kept. Your brick could be easily converted back to original. The dotted part was cut out. I took a photo of it but probably won't be able to find it back.

In my avatar is another option, I wanted a higher screen than you can buy so I used heat to bend a piece of polycarb and cut it to shape with a jigsaw, then filed it for a neater finish.


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[frankenduck]

Here's an update concerning Aeroflow by a BMW MOA member last December that indicates a used or NOS Aeroflow is now the option.

• Dec 19, 2024

      I stopped by the Aeroflow address this morning
 What’s occupying their space is an Orkin pest control
 There’s no Aeroflow signage anywhere on the building nor any we moved to another location sign
 I think it’s safe to assume that at this time there’s no more Aeroflow.

Their web page is in maintenance mode:
https://aeroflowscreens.com/

[The Mighty Gryphon]

The lights I used were everywhere 10 years ago.  They seem to be getting scarce now.

https://www.ebay.com/itm/293371282559

Looks like there is a 20W version now with a little bit different housing.

https://www.ebay.com/itm/335857775477

As far as cutting the windshield, I covered it with blue masking tape, front and back and marked where I wanted to cut it.  I cut it with a jig saw using a plastic cutting blade.  Hold the windshield securely and go slow.

After the cut, I cleaned up the edge with a file followed by wet sanding with finer grades of sandpaper on wood blocks starting with 100 grit going down to180, 220, 320, and 400.  Keep going with finer grades until you get the finish you like.  Avoid sanding on the front or back surfaces.  Just work at rounding the cut edge to avoid scratching the windshield.  Taping where you don't want scratches to protect the surface is a good idea.  Take your time.

[Laitch]

Their web page is in maintenance mode:
https://aeroflowscreens.com/

That's where a website goes when the founder retires, most of the stock has been sold off, the business is in a vegetative state, and heart/lung donors haven't been found.
 

[Martin]

Screens For Bikes in Reservoir Melbourne do a good product with options.
Regards Martin.

[frankenduck]

Hey gang!

I've researched a bunch of threads here and can't seem to find a definitive answer for a tall windshield on the K75s. I'm 6'1 and I get bashed in the face by the wind, but can't get down low enough to really mitigate it. I won't be selling this and getting an RT, as it belonged to an Uncle and is sentimental.

I want to get the Gustafsson 19in windshield in stock width. What's the general consensus on them?

I hooked up with a guy in VA who recently bought an S screen from Gustafson. It didn't fit well on the S fairing. He's into 3-D printing so he scanned the S nose, 3-D printed one and then sent it to Gustafson so they would make him an S screen that actually fit.

[rocketbrick]

Hey guys, did the Mighty Gryphon chopped windscreen. It isn't my favorite look, but it definitely changed the direction of the wind. Great trick! Will be useful for summer riding particularly.

However, I think the tall windshield will definitely do what I'm looking for - looks-wise and wind-wise. Can someone recommend the license plate fasteners recommended before to lock in the taller windscreen? Or should I just use arms to support?

Thanks y'all!

[The Mighty Gryphon]

It looks like you cut straight across.  You might try angling down a bit or putting a radius on the sides to make the corners less extreme.  That is what I did on mine and it looks a lot better than straight across.  If you don't mind doing the work, there is still more shield you can take off.  IMO, the stock shield was way too tall.

If you get it right, it will actually look better than the original screen, more like the classic bikini fairing/shields of the 60's.  Get you that cafe look without hacking off the rear loop.

[rocketbrick]

Beat you to it! I thought the same thing, it looked a bit whacky straight across.

I used my dremel to trim a little more off, and sand the edges best I could. It looks decent! Let me know how you would recommend sanding the edges to make them a bit cleaner :)

[The Mighty Gryphon]

Put a layer or two of masking tape on the surface of the shield front and back right up to the edge of where you are rounding off to protect against any slips. 

Start with a coarse file if you have one.  Use it to do a rough rounding of the edge.

Then 80 or 100 grit sand paper wrapped around a small block of wood to shape and smooth a little more.  Then 120 to smooth it some more followed by 180 and finally 220 to put a bit of a polish on the edge.  Keep going finer until you like the way it looks.