Originally Posted by pnj
I know it's been done because in the bmx world, it took some time before all frames had 'oversized' headtubes. kids had old 1 inch frames but bought newwer 'oversized' (1 1/8) forks.
I don't know how they did it, I just know it involved using loose ball bearings. as in, no bearing retainer.
BMX "1 inch" bikes use a larger inside diameter head tube, than adult type frames do (32.7 mm vs 30.2 mm) even though both use the same 1" steerer outside diameter. I can belive it might be possible on a BMX dimension frame, but no way on a standard "1 inch" there just isn't room.
There's a chart of relevant headset dimensions at the
"Headset" entry of my online Bicycle Glossary - http://sheldonbrown.com/gloss_ha-i.html#headset
Sheldon "No Way" Brown
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