HYES are a patented "Knee-Mounted Air Deflector for Motorcyclist" that greatly reduce helmet wind noise.
If your motorcycle has a windshield, yet you are bothered by the wind, HYES were made for you.
To replay the video, click on the refresh symbol located in the bottom left corner of the YouTube display.
The YouTube video was recorded with a camera phone that the passenger held under the chin of the motorcycle rider. In the video you can hear the wind noise begin to develope as the motorcycle speed reaches about 25 mile per hour. At about 30 mph the air stream is strong enough to move the HYES deflector plate from the ready position to the operating position. While the motorcycle is traveling at about 40 mph, the rider moves the deflector plate to the closed position, allowing the air stream to again flow unobstructed to the face of the rider.
As your motorcycle is rolling down the road, air flows up and over the front side of the windshield. At the same time air is being drawn up the back side of the windshield. Part of that air stream hits your face. The air stream is uncomfortable and annoying. The sound of it could possibly cause irreversible hearing loss. While having a minimal affect on engine cooling air flow, HYES air deflectors prevent the air stream from reaching your face. You will be able to hear your engine. If your motorcycle is equipped with a sound system you will have the option of comfortably listening to it. In addition, if you are out for a ride in the spring or fall of the year, a cold air stream is what you will be keeping from hitting your face.
When using the HYES air deflectors for the first time, most motorcyclists are surprised by just how effective they are at reducing wind and wind noise.
Like R.B. from Texas who's current ride is a Yamaha XV1700. He told us, "After I saw your product, I tested the theory by positioning my open hand at my knee and, sure enough, that's where that blast up my nose was coming from!"
After a test ride using the HYES air deflectors R.B. emailed us again.
BIG difference. They really cut down on the annoying turbulence in the face.
Your site's product info touted that they make it possible to hear the engine at highway speeds; true. Heck, I could even hear my tires!
Excellent idea...great product."