Join Date: Oct 2009
Location: England, currently dividing my time between university in Guildford and home just outside Reading
Bikes: Too many to list here!
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Originally Posted by Phil Tangalakis
I'm looking for
a 1" threaded headset with a 27cm bottom race.
27cm is approximately two feet and an inch, I think you may mean 27mm....
It is possible to machine a fork built for a 27mm race to take a 26.4mm one, if you really get stuck looking. However, the 27mm lower race is part of the JIS (Japanese Industrial Standard), which also prescribes a different size headtube. JIS headtubes are 30mm internal diameter, not 30.2mm like the ISO ones which are more common. If your frame and fork are both JIS, there are a number of compatible headsets, or you can have the headtube reamed out to ISO just like you can with the fork.
It does seem rather unusual that Bianchi, an italian manufacturer, would use JIS, but stranger things have happened.