Hi All
I have just acquired a 90's GT Zaskar Frame (1997) and when I measure the head tube id with digital callipers I'm getting a reading of 1.30 inch (33mm) not the 1.25 its supposed to be (or is it?). Frame looks completely original and untouched...Any advice as to where I can find the appropriate headset for Straight 1 1/8 steerer tube....