I'm thinking about converting my long unused touring bike (Miyata 1000 LT) into a randonneur. As much as I'm a tubular guy, I don't think sew ups would be good choice for a brevet, so I'm looking for clincher rims that would work with wider tires. I'm 200-220 lbs, so with bike and the randonneur stuff the total weight would be in the 240-260 lb range. I'd pick up a SON front hub and would use either a 36h Chorus or 32h Record rear 10s hub. I'm thinking about 35mm clinchers but have ruled out 650b since the bike has cantis. I have a set of Ambrosio Excellence rims but the bead on the larger tires just don't catch on them. I haven't bought a clincher rim in many years so give me some advice on rim and tires.