I screwed up! I picked up an older Schwinn aluminum frame and the INSIDE diameter of the frame head tube is 1-3/16'' as measured with caliper. When I originally measured it with rule I had come up with 1-1/8'' and ordered a threadless headset accordingly; which of course, doesn't fit. The frame originally had a pressed in/threadless headset but I'm in a quandary as to what size headset is required. I bought a FSA Orbit MX 1 1/8'', which has the same internal diameter as my head tube. Any suggestions would be much appreciated!