Wind tunnel development at the Mercedes-Benz Formula One facility shaped the rim profiles that ENVE uses across their wheel lineup, and the 45 rear wheel brings that aerodynamic research to a more accessible price point without sacrificing the core technologies. The 45mm depth slots into the versatile middle ground where crosswind stability and drag reduction reach a practical balance for everyday riding, racing, and triathlon use. Unlike the SES line where front and rear rims use different profiles, the Foundation series uses matched depths front and rear to streamline production while still delivering competitive aerodynamic performance.

The 21mm internal width pairs naturally with modern road tires from 25mm to 28mm, with aerodynamic optimization centered on that range. A hookless bead design allows ENVE to mold the rim to precise ETRTO tolerances, ensuring reliable tubeless seating without the manufacturing variability that can plague hooked rims. The Wide Hookless Bead feature extends protection against pinch flats by creating a broader, more forgiving surface at the rim's leading edge where impacts occur. This technology migrated from ENVE's mountain bike program where bottom-outs are more common, but it pays dividends on rough pavement and when running the lower pressures that tubeless enables.

Carbon fiber construction follows the same principles as the premium SES wheels, including molded spoke holes that route fibers around each opening rather than cutting through them. This approach maintains laminate strength while allowing higher spoke tensions and reducing the material buildup that would otherwise be needed to reinforce drilled holes. The result is a rim that holds tension longer and requires less truing over its service life.... Read More