Fixed head walk reel mower with a pivotally adjustable traction drum having different mowing positions

A fixed head walk reel mower has a frame supported for rolling over the ground. A reel cutting unit comprising a rotatable reel and a cooperating bedknife has a fixed orientation on the frame. The frame pivotally carries a ground engaging pivotal rear traction drum that can be selectively disposed in two different mowing positions when cutting grass at lower or higher height of cut ranges, respectively. This allows a single mower to cut grass at lower heights of cut on golf course greens as well as at higher heights of cut on tee boxes while minimizing degradation in cutting or power performance.