Garth Libre stated and then asked:
> <<......The head tube measures 145 mm from top to bottom where the
> headset parts would rest. The fork is 182 mm from top of fork crown to
> top of threads. In the past I just winged it but some of these headsets
> are pretty costly so I might need a formula to narrow things down.
> What's the formula?>>
>
Formula is: Steerer Tube length minus Head Tube length = maximum headset
height. You will need to know the stack height of the headset, but this too
can be measured.
In your case, you have 182mm minus 147mm = 37mm stack height.
Hope this helps.
Chuck Brooks Malta, NY (USA)
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