Is this thing aero?

Triathlon Forum
1

http://www.blackbookmag.com/this-apparatus-that-makes-your-bike-sound-like-a-horse-trotting-is-a-thing-you-can-buy-1.55121
.

2

Clever and hilarious.

It conjures up the whole monty python gang.

3

No need to call out, “Passing on the left,” with that gadget.