<p>An apparatus (42) for tensioning a drive belt and having a tensioner arm (44) with structure (50) thereon for engaging a surface of the drive belt, structure for mounting the tensioner arm (44) to a support (46) for pivoting movement about a first axis (48) in first and second opposite directions relative to the support (46) including a roller bearing (98, 100) for guiding relative movement between the tensioner arm (44) and support (46), and structure (112) for normally biasing the belt in one of the first and second opposite directions relative to the support.</p>
