A careful examination of a very old tyre will reveal cracks in the walls of the tyre, especially when deflated under the full weight of the vehicle..
In England, the annual, compulsory, MOT (Ministry of Transport) vehicle examination test of all road vehicles, involves an examination of the condition of the tyres.
Any faults will result in a vehicle failure and the offending tyre(s) must be replaced, and the vehicle submitted for a re-test before it can be used again on the roads.
Paul....

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Win 8.1 64-bit. DX11. Advent Tower. Intel i7-3770 3.9 GHz 8-core. 8 GB System RAM. AMD Radeon HD 7700 1GB RAM. DVD ROM. 2 Terra Byte SATA Hard Drive. Philips 17" LCD Monitor. Saitek Cyborg X Fly-5 Joystick. ...and a Briggs and Stratton Petrol Lawn Mower.