Zipp's new Firecrest rim profile is more aerodynamic than any other rim design and it improves handling in crosswinds, wheel strength, and overall ride quality.
The carbon clincher 404 rims have the 4th generation of Zipp's Advanced Boundary Layer Control (ABLC) dimples. ABLC smoothes airflow across the rims surface
Zipp 88/188 front and rear hubs with oversize 17mm axles and bearings for greater stiffness and durability
Front wheel with 16 spokes in nradial pattern
Rear wheel with 20 spokes laced radially on drive side and 2X on non drive side