How to measure steertube diameter?

M

Miles

Devout Dirtbag
I need to to work out whether my fork is 1" or 1 1/8" for my ebay auction. Which bit is measured? the inside diameter or the whole thing - i.e the metal aswell?

Thanks for any help.

Regards,

Miles
 
So if the measurement refers to the inside diamter of the headtibe of a frame wouldn't i need to measure the diameter of the whole steerer tube of the fork rather than just the inside?

Miles
 
you need to measure the outside diameter of the forks' steerer tube. 1" = 25.4mm, 1 1/8"=28.6mm, 1 1/4" = 31.8mm. no difference if threaded or ahead steerer.

the inner diameter of the steerer tube is needed to determine what size quill stem you would need. 1" fork = 22.2mm quill (outer diameter of the quill), 1 1/8" fork = 25.4mm quill, 1 1/4" fork = 28.6mm quill

Carsten
 
Thanks!

Thanks a lot for the replies - thought as much - just wanted to check!

Regards,

Miles
 
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