Originally Posted by DaveSSS

Zipp says that their 23mm IW 303s wheels are optimized for 28mm tires. Mine worked fine for two years, but I recently sold them to get rid of rim tape. Their 25mm IW rims also work with most 28mm and wider tires.

I now have 3 sets of BTLOS hookless wheels, all 25mm IW, with no rim tape needed. I'm running 28mm front and 30mm rear at the same 50-55 psi pressure.