drlogik 

I have an old Pinarello Montello with full Campy. It has Delta brakes and I've always run 23c tires on the old girl but got some 25c's to see if they'd work. They do, kinda. The bike rides a lot smoother with the larger tires so I'd like to keep them...if possible.

There's very little clearance from the tires to the caliper. So little that a small stone could get wedged and cause damage, or worse. I can move the caliper up so that there's enough clearance to the tire but the pad slot doesn't have enough room to move the pads down enough so they don't rub the tires.

I don't want to grind the brake pad slots or the hanger. These are Delta Brakes after all. Anyone have a suggestion? Is there a dropper bolt available that will still fit into the frame's caliper bar recess hole? Or am I destined to put the old 23c's back on?