Bontrager Tires
Race X Lite (RXL) Aero TT Tire
The Race X Lite Aero TT — or what we refer to as the world's fastest tire — is just that. We set out to create a tire that excelled in aerodynamics and in rolling resistance. Like all of our tires, we put this tire up against the competition and it did not disappoint.
The Race X Lite Aero TT lets you use less energy to ride faster. In fact, once you hit 17 mph¹ you start to shave seconds off your ride compared to the next best in class tire:
more than 6 seconds in a 10k time trial
31 seconds in a 40k time trial
183 seconds (more than 3 minutes) during an Ironman cycling leg
Highlights
Unique aero wing design feature for improved airflow over the tire-rim interface
Dual, silica carbon compound for incredible performance and longevity (62/58a)
120tpi casing is lightweight with supple ride characteristics
Integrated breaker ply for added puncture protection
Available in 650c and 700c sizes
Weight: 700x19 180 grams, 700x23 195 grams
Technical Details
Total Drag Force
Finding the World's Fastest Tire was a matter of locating a tire with low rolling resistance that didn't suffer from aerodynamic drag and an aero tire that didn't feel sluggish. This Total Drag Force, measured at wind angles of 0 to 10 degree wind angles, is a combination of both aerodynamic and rolling resistance drag. As you can see from the chart, once you hit 17mph, you can shave time off your ride by using the Race X Lite Aero TT.
Aerodynamic Profile
Tubular tires do not cover the whole rim surface creating a small indentation where the tire meets the rim. Clincher tires fit inside the hook bead of the rim allowing the rim to create a lip next to the side of the tire. These lips and indentations disturb the air and that turbulence leads to aerodynamic drag. The Race X Lite Aero TT tires include a unique aero wing structure that improves airflow over the tire-rim interface.
