When sourcing a truck tyre changer, you must prioritize the clamping capacity and maximum wheel diameter. For standard commercial fleets, a clamping range of 14 to 26 inches is common, but for OTR (Off-The-Road) or agricultural tires, you may need equipment supporting up to 56 inches. Ensure the machine features a heavy-duty hydraulic system with a working pressure of at least 130-150 bar to handle stiff beads. Additionally, look for self-centering chucks and adjustable hydraulic pressure valves to prevent damage to expensive alloy rims.