Originally Posted by
Trakhak
"Nasty wear" on the BioPace chainrings: maybe not. Sometime in the late 1980s, chainring manufacturers began shaping chainring teeth to improve shifting with the recently introduced indexing systems. To that end, they placed sets of shortened and/or twisted teeth at regular intervals around the chainrings. If the apparently worn teeth look like that, they're probably fine.
Outermost ring; the shorter teeth are oriented 180° from each other.
Outermost ring; do these shorter teeth look as they should?
Middle ring: do these shorter teeth look as they should?
What do you make of this set of rings? Do they look as they should, or is there some heavy wear?