Senior Retro Guru
I have recently purchased an American Classic 1" headset which i intend to use on an AMP fork (1 inch threaded as well). Today I received the headset and when I was messing about with it i noticed that it will only screw on the fork maybe 2 turns after which it will get tight quick, so i naturally thought maybe my threads are kinda dirty or buggered, no need to ruin the nice headset so I dug out an old Shimano 1" top-nut which threads on without any problems whatsoever... hmmm... then I dug out an old Ritchey 1" headset and the top nuts on this one also thread onto the fork without any issues. So I contacted the seller and he told me this headset was on a '92 Specialized S-works with rigid fork. Can anybody here shed some light on this? Is it possible that the Specialized used Italian or French threads instead of ISO threads?