Motorcycle Engine Piston Rings 66mm STD For TR250 250 Piston rings set with a standard diameter of 66mm designed for use in TR250 250 motorcycle engines.This component helps maintain proper compression and oil control within the engine cylinder.The rings are engineered to fit precisely into the piston groove and seal the combustion chamber during.Suitable for engine rebuilding or performance maintenance. Compatibility Note: This is a third-party replacement component.Brand and model references are included solely to indicate fitment.