Will Biospace rings fit on most any crankset? I'd love to try a single if you happen to have a little one in 64BCD (four arm) After eight knee surgeries, and one replacement (so far) this might be right up my alley. Am currently using a 20T ring, but would try a 22T or 24T if you happen to have one about?
If more work is involved, may I get details please?