very good

Sorry Joze but the drag a vertical cut piece produces behind is even worse that not having it, must be fixed.

Or, you could go recumbent with a full fairing, add 20 mph!

I don't ride a bike, any more, but, if I did, I would save my $300 for something useful. Can the average rider detect a 15% drag reduction? I doubt it.

The average person would be able to detect a change in excess of 10% but it is pretty expensive, and if you are cycling for exercise, then hardly need it ..

Expensive but if you ride a lot it might be worth it. But how hard would it be to build something similar.

I love bike riding but have always been puzzled by those who claim to ride for exercise but need a super light $1000+ bike or latest aerodynamic accessory to make it easier for their two mile ride. I know that serious competitive riders who often cycle long distances could use the more expensive bikes but it sure seems like a waste of money for the rest of us. I remember many years ago when a guy made a super heavy bike with a concrete frame for those who seriously wanted some exercise. Hopefully, this year I will make it to the gym more than three times on my one year membership but that's another story. We all have our fantasy.

Spot on Bob!

@ Bob Exercising is miserable the light bike aeropack is about making it a fun leisure activity.

Cyclists are about as aerodynamic as a block of wood so a 15% reduction (if it's REALLY 15%) wouldn't make much difference.