I have a Santa Cruz Stigmata gravel/cross bike that will clear 700x40mm tires, but if I mount anything more than 35mm, I felt the wheels are too big and unwieldy, and also causing toe clearance problems. That got me thinking about putting some 650b wheels. Unfortunately by the look of it, the rear chainstays will probably only clear 40 or even less for smaller diameter (see the picture below). In that case, is it still worth going to 650b?