Sorry to have two simultaneous threads going with
requests for mechanical information, but I think this
will be the last for a while.
I have recently purchased a 1978 or so Davidson
Signature frame built up with mostly Campagnolo
parts from that year. The guy who had it (ordered
it custom fit from Davidson's in Seattle) took reasonably
good care of it, but somehow managed over the years
to score the crank axle deeply enough that I don't
think i can just polish it out and proceed with the
same axle, which is one of those strange (to me)
Campy 68-SS-120 +1--+1.5 designations, which
I think refers to additional reach on the axle tapers?
To cut to the chase, this is such a fine frameset
(are you out there listening somewhere Davidson?),
that I have violated a longstanding rule of fix it
on the cheap and popped for a Phil Wood BB
The woman I spoke to on the phone there
(who sounded very confident, competent, and
doubtless knows more about BB's than I could ever
hope to) assured me that my '78 crank is a JIS
taper and I ordered accordingly. I know I've got
the right cups, reach, and a good chainline on trial
installation. I'm just looking for a couple more
informed opinions as to whether I've got the correct
taper. I'd like to not trash the crank if possible
and once I've got the thing installed with threadseal
would prefer not to have to remove it.
I am ashamed to admit that I do not know how a
person measures crank taper accurately enough
to distinguish between the various incarnations that
have come up over the years.