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PostPosted: Wed Sep 09, 2009 9:42 am 
Gold Trader / PoTM Winner / RB Rider
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hi i am trying to help out a forum member with some rigid forks. i have some but no idea what headset size. is it measured from the outside diameter of the steerer? i assume they are but dont want to waste this guys time as he needs them for next week.

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PostPosted: Wed Sep 09, 2009 9:58 am 
King of the DuckBoard
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i just place a ruler across and measure the gap


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PostPosted: Wed Sep 09, 2009 10:09 am 
Gold Trader / PoTM Winner / RB Rider
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so the internal diameter?


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PostPosted: Wed Sep 09, 2009 10:18 am 
Old School Grand Master
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No, the external diameter.

A 1" steerer has an external diameter of 1". A 1 1/8" steerer has an external diameter of 1 1/8". etc.

Internal diameters are 1/8" less (for threaded steerers) - so a 1" steerer takes a 7/8" (22.2mm) quill, a 1 1/8" steerer takes a 1" (25.4mm) quill, etc.


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PostPosted: Wed Sep 09, 2009 10:22 am 
Gold Trader / PoTM Winner / RB Rider
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thanks!


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PostPosted: Wed Sep 09, 2009 11:05 am 
King of the DuckBoard
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one-eyed_jim wrote:
No, the external diameter.

A 1" steerer has an external diameter of 1". A 1 1/8" steerer has an external diameter of 1 1/8". etc.

Internal diameters are 1/8" less (for threaded steerers) - so a 1" steerer takes a 7/8" (22.2mm) quill, a 1 1/8" steerer takes a 1" (25.4mm) quill, etc.


Lucky your here jim :oops: :D


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PostPosted: Wed Sep 09, 2009 12:47 pm 
retrobike rider
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You could of course take a spare 1" 1/8 spacer and put it on the unknown steerer . if its loose it'l be 1" and if its snug 1" 1/8 :lol:


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PostPosted: Wed Sep 09, 2009 1:26 pm 
MacRetro rider
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Further point to remember is that some older mtb's came with 1" diameter forks with an internal diameter of 21.1mm as per the norm for old school BMX. This can be a pain when sourcing a quill stem :roll:


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PostPosted: Wed Sep 09, 2009 1:31 pm 
Gold Trader / PoTM Winner / RB Rider
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perry wrote:
You could of course take a spare 1" 1/8 spacer and put it on the unknown steerer . if its loose it'l be 1" and if its snug 1" 1/8 :lol:


thats what i would have done if i was at home only way for an idiot like me to be sure


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