40t is as small as Shimano made Biopace 130BCD rings. They were found on a low-end (even below Exage, as I recall ) OEM group. I have purchased complete cranksets just to get that 40t ring.
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You know it's going to be a good day when the stem and seatpost come right out.
(looking for a picture and not seeing it? Thank the Photobucket fiasco.PM me and I'll link it up.)