Medium Duty J Top Mount Bifold Measurements | Goldberg Brothers
| J Top Mount Roller Measurements | |
| Height Above Door | 4-7/8 inches |
| Roller Thickness | 1-1/2 inches |
| Roller Width | 3-1/2 inches |
| Roller Height | 4-1/2 inches |
| Wheel Diameter | 2-1/2 inches |
| Track Width | 1-1/2 inches |
| Track Thickness | 3/16 inches |
| Door Panel Weight Capacity | 62-1/2 lbs |
| Minimum Door Thickness | 1-1/4 inches |
| Maximum Door Thickness | 1-3/8 inches |
| Door to Track Spacing | 7/8 inches |
