i converted an old road bike to FG and it had the same deal on the two bigger rings. i wanted it done and on the cheap so i sliced the smaller ring into pieces and left like two teeth on each little piece, just for *****s sake. they were like little toothed spacers. my brother proceded to paint the tips of the "spacers" red so it looked like blood, lame i know.....little bro's, haha