Do these have removable valve cores so...
Do these have removable valve cores so sealant can be used with them?
I think the older ones do, if the valve is the brass colour. If the valve is red, I believe they are not removable. You can contact one of the tech gurus and they will give you the info you need.
These are a very high-end race tubular, so I would not be inclined to put sealant in these, they are meant to stay as light as possible to limit resistance.
These do not have removable valve cores, but the ENTIRE VALVE is removable from the tire. To add sealant, have the tire off the rim, and remove the red valve completely from the tire. Super easy, and easy to replace the valve if you break it!