tapered bottom bracket

cliff said:

I have an old 110 mm bolt circle Ritchey Crankset that has been mounted on a Campy record spindle
(116 mm?) I know that the Ritchey crank is meant for a jis taper and the campy is an ISO taper.
The crank does not bottom out on the spindle-it actually seems like an OK fit. My questions are 1)
does anyone know what the recommended spindle length for this crank is?, and 2) what is the exact
difference between a jis taper and an ISO taper? TIA

Sugino ( and their Ritchey label cranks) have been through more than a few design iterations so no,
just being a "ritchey" crank isn't descriptive enough.

The two spindles are different sections of the same taper, starting at 12.5mm for all the many
brands of classic spindles (Including Shimano) until the recent Shimano-promulgated 13mm start which
has made this so frustrating.

There was at one time a different taper angle ( 2 deg. for cast aluminum cranks) but that is so rare
now and so visibly different as to cause no trouble.

Regarding spindle length, which has become shorter generally over time, here's a good comparison:
yellowjersey.orgCRSPNDLS.JPGOpen ↗

--
Andrew Muzi www.yellowjersey.org Open every day since 1 April, 1971