Hi,
     The "suggested" tempo really has no direct bearing to the size of the
take-up spool on most 88-note recordings.  The paper is "pulled" through the
perforator at a constant speed by rollers, not by the end tabs of the rolls.
     The only music rolls that there would have been a relationship between the
spool size and the recording would have been the companies that had a direct
involvement in the production of the piano itself, ie. the
AMPICO/DUO-ART/WELTE/ARTECHO's etc.  In the Re-enacting instruments, tempo is
semi-critical (actually, it's VERY critcal on the recordings of a classical
nature!!! Less so on the popular.), but not in the straight 88-note music
rolls as they were subject more to "personal" interpretation and inclusion of
the operator.
     Hope this helps.

Robin Pratt