BORA ULTRA 80
BULLET ULTRA 80MM
This question in part relates to Campagnolo nomenclature that extends across the wheel range.
Where a wheel is described as "Ultra" you will find a carbon hub body with alloy flanges bonded on, and an open bearing system. The bearing system may be ceramic-on-steel running in a grease bath (called USB) or may be ceramic-on-stainless steel (called CULT). The Bullet 80 Ultra is available in both versions, the Bora 80 Ultra only in the CULT version.
Non-Ultra wheels have an all-alloy hub and runs on sealed cartridge bearings which have a higher pre-load, and therefore more rolling resistance than their "open" counterparts. The wheel is also heavier as the cartridge bearings and the alloy hub shell weigh more than their Ultra counterparts. They are, though, less expensive.
There is a difference in the tyres that these wheels are designed for, in that Bora are designed for tubular tyres which are bonded to the rim, wheras Bullet in both "normal" and "Ultra" format are designed for clincher-type tyres which fit like "normal" cycle tyres.
Unless you are racing at elite level, tubular tyres, although generally felt to offer better roadholding and to be "faster" are probably a complication that you neither want nor need. If a tubulat tyre punctues, in practical terms,