Vision Tech USA Aerodynamics
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Aerodynamic efficiency, which minimizes air resistance on the leading edge of the bicycle, is essential in reducing energy expenditure and helping the rider gain time. Wind tunnel tests at Texas A&M; have determined that the streamlined Vision Tech time trial bar reduces overall drag by 0.2 - 0.3 lbs., compared with a conventional aero bar/bullhorn setup. This reduction in drag can translate to up to a minute time difference in a 40K time trial. The extended use of airfoil shaped contouring and tubing throughout significantly decreases air turbulence.

The following chart lists projected times for a 40 km time trial based on wind tunnel tests at Texas A & M University on January 11, 1999

PROJECTED TIME AND SPEED (MPH) FOR 40K DISTANCE
WATTS PRODUCED BY RIDER >>
250 WATTS
~ 22 MPH
285 WATTS
~ 25 MPH
390 WATTS
~ 28 MPH
450 WATTS
~ 30 MPH
HANDLEBARS DRAG @
30 MPH
MPH
TIME
MPH
TIME
MPH
TIME
MPH
TIME
Vision Aero .590 23.03 1:04:45 25.23 59:07 28.36 52.36 29.88 49:55
Vision Tri-Max .685 22.93 1:05:01 25.12 59:23 28.23 52:50 29.74 50:08
Profile X-Bar .704 22.91 1:05:05 25.09 59:26 28.20 52:53 29.72 50:11
ITM Dual Aero .722 22.90 1:05:08 25.07 59:29 28.18 52:55 29.69 50:14
Cinelli Angel Aero .759 22.86 1:05:14 25.03 59:35 28.13 53:01 29.64 50:19
ITM Aero CX2 .826 22.79 1:05:26 24.95 59:46 28.04 53:11 29.55 50:28
Syntace Bullhorn/ Syntace C2 .861 22.76 1:05:32 24.92 59:51 28.00 53:16 29.50 50:33
Profile Bullhorn/Split Second .871 22.75 1:05:34 24.90 59:53 27.99 53:17 29.49 50:35
Drop Bar/Split Second .929 22.69 1:05:44 24.84 1:00:02 27.91 53.26 29.41 50:43

Aerodynamic Positioning:
To be in the best aerodynamic position, keep the back as flat and low as possible without loosing power output and comfort. It's best to use the Riser Kit to adjust the elbow pad height. The Riser Kit also allows the air to flow over the wing and under the armrest plate with the least disturbance.

Also See:
The Aerodynamic Facts
Aerodynamic Drag of Streamlined Handlebars 1995




© 1999 Vision Tech USA, INC.