[ikeboy]

Can you guys recommend an aerodynamic top case for highway cruising speed of 120 kilometer/hour.
I'm leaning towards top cases with a more oval or round shape because the box shaped cases are terrible at crosswinds.
Anyone tried the SH39 or SH58?

I currently have the SH34 but need more space for me and my pillion to fit at least 2 days worth of clothing.
SH34 is fine at 100kph but I start to notice turbulence at 120kph. Felt like it was gonna fly off when I did short bursts at 160kph.
I removed the side panniers because it was causing too much wind drag and uncomfortable for pillion position.

 

[Sniffy]

I went with the Givi B330 NTA which is a scooter case, but seems fine at 120 kph on the littlest Duke. It's mounted on the SW-MOTECH Street Rack. I chose it as a compromise between capacity and aerodynamics; it's longer than it is wide. Probably not something you would consider, since you already have all that sunk cost into SHAD hardware. Food for thought at least. Here's a photo:

 

[ikeboy]

your Givi looks nice on your bike. Just the right fit, and it seems to sit lower than shad.
Thanks for the tip, I'll look for longer cases instead of wider, for better aero.
I found this Givi V40 has the same shape with our top cases and might do the job.

BTW what windshield do you have? it looks great.

 

[Sniffy]

BTW what windshield do you have? it looks great.

It's a Puig Bat. It works very well on the little Duke. I have seen Chinese knock-offs on aliexpress for less than half the price, but I'm not sure I would trust the mounting hardware on those examples. It is interesting to me that such an unusual screen design would warrant a knock-off. I guess it speaks to the popularity of the design.