I wonder how different they are to the regular SES wheels: https://www.enve.com/en/lp/foundation-road/. For example, the SES 5.6 Disc is about 100g lighter than the Foundation 56 which is almost entirely due to the rim difference - the foundation is 1/2mm wider than the SES 5.6 Disc front/rear. The hubs look to be the same ENVE Alloy. Would be interesting to see some independent test data.