Orange Seal VersaValve Tubeless Valves - 80mm C-class they are available in either

they are available in either 160 or 140 millimetre diameters and are perfectly safe owing to rounded corners that facilitate insertion in the calliper as well

USB cup-and-cone bearing system

38mm w/o fender

Short version

Orange Seal VersaValve Tubeless Valves - 80mm C-class they are available in eitherVersaValve consists of a valve stem with a large, sturdy base plate that can be fitted with different shaped rubber grommets. The large base plate ensures a solid contact with the rim bed and the adaptable grommets provide an airtight fit on all shapes and depths of rim. VersaValve will work on most rims: mountain, road or CX. Grommets are easily replaceable and the various stem lengths mean valve extenders are no longer necessary on deep section