I manage to convert my 700c rim brake road bike to a 650b rim brake gravel bike using a set of beautiful custom rims from the good people of EIE. Normally all 650b rims are designed for disc brake, EIE was nice to custom make a set with brake track without any additional cost for me. Now my bike can fit in a 650b x 32mm tires. Need to pair them with Tektro R539 brakes.