Have you heard about the new Pacenti Brevet rim? A bit pricy, but very light:
https://www.bikerumor.com/2016/10/25...rza-rims-2017/


I've been running Panaracer Pari-Moto 650x38b's (also a Pacenti design) on my conversion. Very nice tires. Light, supple, smooth, fast, but may not be the longest-lived. Don't have enough miles on them yet to know.


When/if I build up a "fancy" 650b bike I'll most likely use Brevets and Pari-Motos.


SP
OC, OR