On a Phil Wood bottom bracket, where is the "offset" controlled? Is
this a function of the spindle? If so, then why isn't that datum
required when ordering just a spindle alone? For example: according to
my super computer, optimally, I need a 122mm spindle with an 8mm right
offset or as close as I can get to that in the real world. I
understand that I can get +-5mm by adjusting the cups L/R. BB
cartridges sold without cups tend to specify an offset such as "R+5".
That the spindle alone doesn't have an offset specified but the BB
cartridge does leads me to believe that this value is controlled to
some extent by the BB assembly independently of the spindle and
position of the cups. Am I correct in this belief?
This old tandem is definitely a "weird load". It looks like someone
once set up a way to shift the timing chain on one end between a 32 and
34 tooth timing ring. I am assuming that the logic here was to change
the crank synchronization dynamically... shift, pedal until you reach
the desired synchronization, then shift back (that adds about 3 lbs of
hardware!) It's an interesting idea; however, I believe that I'm going
to have to cite Murphy's Law, scrap it, and return to the stock
configuration. Simplicity has its own beauty, IMO.
Jones, who seeks only wisdom, enlightenment, and to serve God... and to
grow rich, of course, as all men.