Abstract: A supplemental wheel for a golf bag cart including a mounting block that is securable to a lower bag support of a golf bag cart. The mounting block has a generally rectangular configuration defined by a short top wall, a short bottom wall, long opposed front and rear walls, and right and left side faces. The mounting block includes an angular cut-out extending from the short bottom wall through the long rear wall. The short top wall is securable to the lower bag support whereby the cut-out is disposed in an essentially parallel relationship with a recipient surface that the golf bag cart is position on. A swivel wheel assembly is secured to the cut-out formed on the mounting block. The swivel wheel has a braking mechanism coupled therewith.