Hi,
I am building up a touring bike from a vintage Miyata 310 frame. I have 32mm tires and Tektro r539 brakes. No problem on the rear, but when the front caliper is open, the right arm goes into the tire about 3mm. I have to squeeze the caliper to mount the tire. That being said, they will work once the cable is installed. They can open enough without contacting the tire, but I guess the obvious concern is if the cable brakes while in motion, it could result in an endover I suppose. I tried the Tektro r559 and they do the same thing, but the brake arm only goes maybe a millimeter into the tire.
Does anyone have a setup with such tight tolerances? The rim is Mavic Open Pro, so it is narrow for that tire, and I presume a narrow rim makes a taller tire? Three Rivendell website mentions using 32mm tires with the 539s, but I know there are lots of variables from the tire to the rim to the fork, etc. The tires are Conti GP 4 season. I haven't found a good way to compare tire height across different brands or models. I found a folding 30mm tire (Challenge Strada), but I suppose even those may not fit. I was going to avoid doing to 28mm. Any advice?
Thanks!