According to your responce, if they are ISO that means that my Chainline should be a few millimeters inwards.[/quote]
see my quote above.
use a little shorter JIS spindle to replace an ISO spindle and you will most likely get the chainline right.
the tapers on ISO and JIS should have the same angle but the JIS is a little larger so less interface between crank arm and spindle. it might work ok or it might fuck up the cranks.
one thing though. if you try to put the cranks back on the proper spindle you probably gonna be bummed out with the result.
the answer of using a 109.5mm ISO taper spindle like bigmatt said sounds right because that’s what the older campy track cranks use and most of these cranks that looks the same are all similar to the campy cranks…
according to sheldon the taper is the same degree, one just ends a little sooner than the other and he used mismatches all the time with no bad results.
that being said, he does refer to the taper widening with lots of removal and installation when used on the wrong bb. why would that happen?
[quote=aek]according to sheldon the taper is the same degree, one just ends a little sooner than the other and he used mismatches all the time with no bad results.
that being said, he does refer to the taper widening with lots of removal and installation when used on the wrong bb. why would that happen?[/quote]
I believe if you use ISO on a JIS spindle this happens because the JIS, although the same 2 degree taper, ends tapering at a greater width. This could allow your ISO cranks to slide up farther than they theoretically should and and widen up the taper on your cranks.
might be other way around though, JIS cranks on an ISO taper, cant remember.