Amazon wanted to know if the UNICHE Bike Presta Valve Cap met my expectations. Boy did it ever!!! It may not look like much, but I’ve been saving up all year for this upgrade. In name it is a mere Presta Valve Cap, but in reality it is so much more than that.

Because of the advanced aerodynamics of this part, it really changed the way I am approaching riding. I could feel the difference right away from the moment I fastened this cap to my bike’s valve stem. When riding up steep hills that I have struggled with so many times in the past, the streamlined contours of the cap seemed like it did all of the hard work for me. It didn’t just take the air that I was cutting into and displace it so it traveled the opposite direction behind me. It took that air, displaced it behind me, but then it actually wrapped around the bike, turned around and funneled that air directly behind my back, and then it went in the same direction as my travel and it actually pushed me forward*** (please see schematic engineering diagram below, which visually illustrates this concept).

Another advantage that I took note of is that it emits a sound frequency which is inaudible to human ears, but it fends off mosquitos, gnats, ticks and spiders. And that’s just with one cap on one tire. If you put caps on both tires, it doubles the volume of the pest control frequency and that repels black bears, bobcats, venomous snakes, hikers, dog walkers and whatnot. It is written in the owners manual that this nightmarish sound haunts the dreams of pests, so they are deathly afraid to go anywhere near it. When not riding, I will be wearing one around my neck.

Another advantage of this cap is the particular shade of green. There is nothing technical, mechanical or scientific about that. I just like the color green. Best $7.50 ever spent.

Here is a technical schematic that demonstrates the efficient aerodynamic properties of this advanced Presta Valve Cap.