Proform Lifestyler 235715 Treadmill Rear Roller Genuine Original Equipment Manufacturer (OEM) Part This part is compatible with models including; 831296041,831296042,831296230,831296231,831296330,831296040,831296331 Rear roller 235715 supports the walking belt and controls the walking belt tension Genuine Original Equipment Manufacturer (OEM) part. Compatible Brands: Proform This rear roller (part number 235715) is for treadmills Unplug the treadmill before installing this part