Replacement piston ring for a lot of kits. Measure your broken or worn ring to be sure.
Fits nearly all 47mm Motobecane kits. All of the Airsal 47mm kits for av10 and av7. Also fits the Parmakit 47mm kits for av7 and av10.
Is also a good replacement for the bottom ring on 47mm Puch Gilardoni and Metrakit.