BSA C25 - B25 / Triumph TR25W piston ring set (70-6838, CP211 / R23010)
condition: NOS Made in England Sizes available: STD (67 mm) + .020" .040" .060" Oversizes
fits 250 unit motors 1959-1966 C15 Sportsman 250 Star SS80 Sports Star
oil ring = 1/8" piston rings 1/16" wide