I'm building an old crappy 650c nishiki tri frame into a beater for NYC. I was planning on lacing 26" mtb rims to some formulas and using narrow MTB tires for better cornering and a little bit cushier ride, but I stumbled upon a 650c wheelset so I'm looking for a little bit wider tire for said wheelset. If it doesnt exist, I'll ride on 23c's without hesitation. Thanks dudes.