What Our Gearhead(R) Experts Are Saying:"The 4. 5 PRO is the wheel I put on a bike I'm racing on mixed terrain or any route with elevation. The depth gives me aerodynamic return on the fast sections without the crosswind handling tradeoffs you get from a deeper rim."Why We Like ItThe G SES 4. 5 PRO runs the same independently shaped front and rear carbon rims as the standard 4. 5, each profile tuned for its respective airflow demands and sized to smooth sidewall transitions on gravel racing tires. The ENVE INNERDRIVE PRO hub adds ceramic bearings, an ultralight 40-tooth alloy ratchet kit, and alloy nipples for a 45-gram weight reduction. Wide Hookless Bead construction handles impact at the bead to reduce pinch flats on rough gravel, a technology carried into the G SES line from ENVE's mountain wheel program.