On Dec 6, 2:57 pm, Jim Thill - Hiawatha Cyclery <[EMAIL PROTECTED]>
wrote:
> Sealed bearings are usually a cartridge bearing, while regular
> bearings are loose balls or balls in a retainer ring. A sealed unit is
> probably better for wet weather, but the unsealed ones are fine and
> usually a better bargain. JIS and ISO are identical except for the
> crown race diameter.
> JIS 27.0 mm
> ISO 26.4 mm
JIS head tube inner diameter is also smaller, 30.0mm vs. ISO's 30.2mm.
The cups are a very tight fit, but usually go in without modification.
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