ErgottWheels

This is the new Velocity A23 rim shape.  It is now tubeless ready, but you can still use standard tube/tires.  The new shape gives a more secure hold to a tubeless tire, makes is easier to mount, and helps prevent burping.  Burping is a sudden pressure drop when the bead loses temporary contact with the rim bead.  My rims come with Veloplugs (still fits this rim) installed unless you want tubeless tape.