dan_s said:i have an old 70's french steel road frame (sifem - luis ocana, FWIW)
which has the usual cup and bearing type bottom bracket. the current BB
is probably (not sure about thread type and direction) compatible with
the sugino type, as in here:
http://parts.spicercycles.com/site/page.cfm?PageID=37&SKU=CR5022
is it possible to fit a modern cartridge type BB in this frame?
is it worth doing the conversion?
"Worth it" all depends on your definition.
Really the only advantage to a cartridge type BB is availability,
IMHO. They're somewhat heavier, and can't be maintained (so they'll
wear out quicker than the re-lubable, adjustable, rebuildable cup and
cone BB). The good news is that the cartridge BBs are cheap and do
seem to last a long time (providing you don't do silly things like
riding through deep water, which can kill 'em very quickly).
So basically, if your old cup and cone BB is still working well, you
wouldn't really be "upgrading" your bike by swapping it out for a
modern cartridge BB.
Mark Hickey
Habanero Cycles
http://www.habcycles.com
Home of the $695 ti frame