Motorcycle Part STD BORE 66mm Piston Rings For TR250 250 PISTON RING This piston ring set is designed for use with 66mm bore engines compatible with TR250 and 250 models.The rings are engineered to maintain proper compression and oil control within the cylinder.Each set includes standard size piston rings that fit OEM specifications for performance in two-stroke or four-stroke engine applications where applicable.The components are built to withstand typical operating conditions found in motorcycle engines.Installation requires proper tools and adherence to standard mechanical procedures.