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Designed with the aide of legendary aerodynamics guru John Cobb, the new Wing57™ has undergone extensive wind tunnel testing to become the best TT helmet on the market. Through this testing, Rudy Project and Cobb developed a unique tail geometry that works best for all TT positions and back profiles. Proven to beat out most competing aero helmets in time simulations, the Wing57™ will be, without question, the best aero helmet on the market throughout the triathlon and cycling worlds.
When choosing a bike helmet, a good fit is vital. Most helmets come in small,medium, large or extended sizes. To find your size, wrap a flexible tape measure around the largest portion of your head—about 2.5cm. above your eyebrows. Or, wrap a string or ribbon around your head, then measure the length of string with a straight-edge ruler or tape messure. Look for a helmet size that matches your measurement. The size range is listed under the "Specs" tab on each product page.
General sizing parameters for the WING57:
Between sizes? Either opt for the smaller size or wear a cycling cap or beanie to improve the fit of the larger helmet. .
Helmet sizing and fitting instruction can be found here - HELMET SIZING