Technical & Reference Section > Tech and Restoration

headtube & headsets diameter sizes

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20to26:
I've noticed on some of my GT frames that some headset cups fit very loosely (like they're 1.1/8"...) and I need reducers to fit a 1" headset. Strangely I just removed a Hatta MX-II from one to fit an Epoch headset and I need reducers... :-\

anybody know what gives? Are there 1" headsets with different cup size diameters on the OS bikes?

thecrooch:
it may be (and dont quote me on this) a road 1" headset - BMX headsets have a different size to road even though both are 1"

Chris King do an explanation that ill try and dig out in a mo....

here: http://www.aspirevelotech.com/Reference/CupSkirt.htm

20to26:
thanks for that Si, it seems odd that in this particular case I'm fitting a GT Epoch style headset into a GT BMX frame and it's not a snug fit. About 1mm out each side as the chart in the link shows. So perhaps GT made some narrower cup diameter headsets too for some reason.

thecrooch:
Shim it with a coke can  - always works!

tobybrown35:
had same problem dans comp do a shim 7 dollars and about 40 dollars postage  :daumenhoch:

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