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Anyone seen ready-made bike aero extensions or streamliner producer ?

Not asking about velomobiles. Looking for something between.

Are there any significant improvements of common bicycle in terms of effectivity (aerodynamics), comfort (covering, waterproof), etc. ?

Links about fairings:
Could fairings provide the biggest aero gain we’re all missing out on?
Aerodynamics of Real-World Bicycles
SpeedUp bag

Thinking about kind of small air balloon in front giving a drop shape - probably one of few options to reduce F(C).

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  • I strongly recommend you research other sources of data outside of youtube quotes and sales guff.. To pick a point - if a disk wheel was 2 watts compared to 15 watts of an aero wheel then they would be used a lot more despite the consequences of windage (being a sail in a side wind)
    – Criggie
    Jul 13 '19 at 8:54
  • Clarification request - what is your actual question? SE isn't very well suited to open-ended questions or polls or general discussion.
    – Criggie
    Jul 13 '19 at 9:05
  • I'll ask again - what is your question?
    – Criggie
    Jul 16 '19 at 9:13
  • AndyP - experiment finished - after 30(?)km it went a bit out of original position, but best test was company garage - after passive downhill I drived around whole garage and still needed breaks @exit, but with the box I did not need use 'em ;-) Looks like a pro's like aero improvements are better - limit separate obstackles or change their shape to be more eliptic or drop to prevent bad circulations and do not increase front area. Maybe cover space inside frame triangle, etc.
    – Tom
    Jul 17 '19 at 9:09
  • 2
    Please read the tour to refresh your memory on how Stackexchange is organised.
    – Criggie
    Jul 17 '19 at 20:08
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Product recommendations are off-topic for bicycles.se, but yes, there are a few. They mostly cater to recumbent riders. A web search for bicycle fairing should give you some options.

There are also velomobiles, which are fully or mostly enclosed recumbent trikes sold as a finished product. These are not designed purely for speed--they're usually intended as practical everyday vehicles.

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