Abstract: An apparatus including continuous rigid or semi-rigid annular conduit includes a mercury balance fluid therein contained within the conduit within a predetermined arc. The conduit may include baffle members to maintain orientation of the fluid within the conduit, and optionally includes a ribbed interior surface to enhance securement of the conduit to an interior surface of an associated wheel rim. Further, a modification includes the ribbed surface spaced from an interior annular surface of the conduit by a narrowed central web to permit flexure of the balancer during use to enhance positioning of the balancer when not correctly centered on the associated rim of the wheel.