Keeper of the Mighty Macaulay said:I'm working on getting a 1960s Torpado up and running and
have removed the cranks and bottom brack spindle but can't
get the fixed cup off (it's got three notches, not
opposing flat faces, and I don't have the proper diameter
lockring and hammering with a screwdriver is just damaging
my screwdriver).
There's a trick to doing these with a big bolt.
See: sheldonbrown.combbcups.htmlOpen ↗
Quoted message said:I'm thinking that I could just leave the fixed cup on an
get a new bottom bracket for the other side and put on
newer square-taper cranks.
That's perfectly reasonable if the cups are in decent shape.
Quoted message said:1. If I dremel or otherwise get a good hold on the cup to
put the frame in the bench vice, which way is the fixed
cup threaded?
Italian thread is right-hand on both sides, lefty loosey.
Quoted message said:2. If I go for a new square-taper spindle, is there a
formula for determining a proper spindle length?
Current spindle is 134mm end-to-end, 42mm edge-of-cone-to-
end driveside, 32mm non-driveside. The bearings look to
be the same size (1/4"?) as other bottom brackets so
I'm assuming I can use the fixed cup that's well fixed
in there.
That's true. You'll also want to match the distance betwixt
the cone ridges on the spindle. Italian bikes generally have
70 mm shells and call for a 5** series spindle.
How long it needs to be is not a matter of formulae, but has
to do with the crankset you choose and the desired
chainline.
See: sheldonbrown.combbsizeOpen ↗ for detailed info on
that.
Sheldon "I'd Use A Shimano Cartridge Unit..." Brown
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