i think you nailed it with the split taper ring. Is it rubber with a beveled edge and notches? I stoll one of my old bike and everything seems good now, but my dustcap still seems alittle hight so I may have 2 of something. Supcom just for future reference sportmart is a sporting goods store that sells bikes skies hockey football baseball and basketball equipement depending on the season. They sell good equipement not the best not the worst.