Bontrager's newest family of overachievers: R Series road tires.
The family boasts weight-saving, speed-enhancing, and flat-preventative technologies, so that every model is lighter, faster, and stronger than its predecessor-including the R4 Aero, the world's fastest tire. Let the overachieving begin.
Bontrager's exclusive aero wing technology expands throughout the line. First developed for the Race X Lite Aero TT tire, the unique aero wing design improves airflow where the tire meets the rim, so the rider uses less energy to ride faster.
Higher TPI section
A jump from 120 to 220 TPI (threads per inch) allow for lighter weight tires with a more supple ride. Available on R4 and R4 Aero tires.
The R4 Tubeless tire is designed to work in conjunction with road tubeless wheels providing the supple feel of a tubular, improved clincher grip and removes the potential of pinch flats.
The World's Fastest Tire
Until now the Race X Lite Aero TT tire was the World's Fastest tire. We set out to produce a faster tire and succeeded with the R4 Aero.
- less surface drag due to 220 tpi casing and low rolling resistance 62a tread compound
- less wind drag due to Bontrager exclusive aero wings and new 22c profile optimized through computer fluid dynamics
The R4 Aero lets you use less energy to ride faster while shaving seconds off your ride when compared to the next best in class tire:
- more than 9 seconds in a 10km time trial
- 37 seconds in 40km
- more than 3 minutes in an Ironman leg
You'll Love Our Tires. We Guarantee It.
We're so confident in the performance of the new Bontrager tire line that we're backing it with a guarantee unsurpassed in the bike tire business. All Bontrager tires are unconditionally satisfaction guaranteed for 30 days from the date of purchase. If you - for any reason - don’t like your new Bontrager tire, return it (along with your original sales receipt) back to the place of purchase within 30 days of purchase date for full refund or exchange. It's that easy.