I have a 2006 Specialized Langster, size 50cm. I replaced the brake calipers years ago with older-style Shimano 105 single-pivot sidepull brakes.
The brakes have never been very powerful. Worse yet, the rear brake caliper fixing bolt seems pretty short and the brake sits close to the seat stay bridge, resulting in very little clearance between the pads and the seat stays. This severely limits which pads I can use because most pads bang up against the seat stays and ding it repeatedly.
I'm thinking of replacing the brakes with newer, dual pivot 105's for better stopping power. Is there a way I can tell if those brakes will fit or not before I order them (ie what measurements do I need to know and compare with the newer 105 dual pivots?). Also, I'm wondering if those brakes would provide enough clearance for 28mm tires. I would appreciate your thoughts.