Zipp's do-it-all performance wheel, the 404 Firecrest is a great option for the climbing stages and the flats, TT's and gravel. At 58mm deep, this wheel has enough depth to make an aero difference, while staying relatively light at 1516 grams for the pair. If you want 1 wheelset that excel at everything, the 404 Firecrests are the ones you've been looking for.
With a 23mm internal rim width, the 404 Firecrest can take a range of tires, from a purebred, 25mm race tire, to a true knobby gravel tire. This wheel is tubeless ONLY - meaning that you must use a tubeless tire on the rim. You may use a tube in the tire, provided that it is a tubeless compatible tire. See Zipp's official tire compatibility guide here.
*1516grams for the pair *58mm depth *23mm internal rim width *Tubeless only, hookless rim *73psi maximum tire pressure (Zipp recommends against using a tire whose minimum tire pressure is over 73psi)