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Surely there aren’t multiple standard diameters for 1 inch headsets?
Well, there are, but you usually have to go looking for them rather than stumbling upon them by accident. As it happens, the Orbit X1 and Duron do come in a choice of JIS (30.0mm cups) or ISO (30.2mm cups), so the most likely explanation is that you've accidentally got a JIS headset, which could be loose in an ISO frame.
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gbj_tester
Tomalex
Anyone had trouble with FSA headset cups not fitting 1 inch steerer tubes properly? I’ve tried the FSA Orbit X1 threadless and the FSA Duron threaded headset on two different Colnago C40s and each is just a little loose. It fits in the tube and can even stay in place but it’s not as tight as it should be and can easily be pulled out by hand. Obviously the cups need to be pressed in so something isn’t right.
It’s not the frames as I’ve fitted 1 inch headsets in them previously (an old Ritchey and an unbranded one). I’ve ordered an M Part headset to try but I’m at a bit of a loss as to why these don’t fit properly. Surely there aren’t multiple standard diameters for 1 inch headsets? Anyone know?