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Old 11-11-10, 12:59 PM   #1
HaroImpasse
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irregular head tube?

restoring a 1990 Haro Impasse MTB and inside dia of head tube is 1 3/16ths. I know this is an irregular size. Is anyone aware of Haro using an irregular head tube size during this period, or is it just going to be a loose fitting 1 1/8 headset?

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Old 11-11-10, 02:28 PM   #2
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30.2mm is the normal size for a 1" standard headset. Can you get a more accurate measure than 1 3/16th?

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Old 11-11-10, 03:20 PM   #3
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the inside of your headtube? or your steerer? what size wrench did you use to take it apart? 32 or 36?
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Old 11-11-10, 10:57 PM   #4
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Don't confuse nominal headset sizes which are by fork steerer diameter, with the inside dimension of head tubes they fit. Obviously the head tube must be bigger than the nominal size to allow for the thickness of the pressed in cups and clearance for the steerer.

Here's a link to a list of standard headset dimensions published by Sheldon Brown. I'm sure your Haro isn't an oddball and matches one of those listed there.
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Old 11-12-10, 01:54 AM   #5
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Quote:
Originally Posted by FBinNY View Post
Don't confuse nominal headset sizes which are by fork steerer diameter, with the inside dimension of head tubes they fit. Obviously the head tube must be bigger than the nominal size to allow for the thickness of the pressed in cups and clearance for the steerer.

Here's a link to a list of standard headset dimensions published by Sheldon Brown. I'm sure your Haro isn't an oddball and matches one of those listed there.
That's might be true.
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