Park Tool PB-7 Repair Stand and Truing Stand For PB-1 The PB-7 Repair Stand and Truing Stand quickly mount to the PB-1 Portable Workbench to create a complete workstation! The Repair Stand securely clamps the front fork dropouts and bottom bracket for quick repairs and adjustments on most road and mountain bikes. The Truing Stand attachment allows truing of wheels up to 29. Wheel dishing (centering) is performed by simply flipping wheel in stand.