Berges® Spring Tensioning pulley type F280sb for use with wide belts type CW-b 55 and fixed diameter pulley, speed change achieved by changing center distance between sheaves. Diameter 296mm with length through bore of 190mm, one spring on each side of pulley for a total of two springs. Identified by casting numbers x and x stamped on pulley faces; castings maybe used on other series of pulleys. Maximum shaft diameter 42mm with standard bores listed for sale, alternative bores are available contact TVT for non-standard bore quotation.