Originally Posted by
Seattle Forrest
The Enve 4.5 ARs, or prototype versions of them, spent hundreds of hours in a wind tunnel on half a dozen different bikes. The LB ones didn't. That's not important to 99% of the world's cyclists, but it's an expensive difference
This is true. but there's nothing that's proprietary about Enve's rim shape(like Zipp hoops), so the shape is easy to copy. Rim strength and weight can be determined using FEA. The framebuilder I know does this for his framesets, and it doesn't cost a fortune.