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Changing a flat tire no longer need be a chore if the Newmatic jack is used. The Goodrich jack is a compact, inflatable, textile, and rubber cylinder capable of extending vertically to lift a vehicle wheel off the ground. It is stable and easy to operate. Inflation pressure for most standard-sized cars is in the range of 20-25 psig. The inflation source can be a compressed gas bottle, a compressor driven by the engine, or an electric motor driven compressor plugged into the cigarette lighter. The Newmatic jack can be stored within the spare wheel. In today's automobile with limited storage space and uncertain lifting methods, the Newmatic jack offers the chassis engineer considerable freedom of choice.

The increase of rubber stiffness with age causes radial tire cornering stiffness to significantly increase during warehouse (shelf) aging. The increase in cornering properties is linear with the logarithm of time and dependent on storage temperature. Five different brands of radial tires studied age in a very similar manner, exhibiting the apparent effect of two different aging mechanisms. A limited experiment indicated an approximate balance of aging and break-in effects on radial tire cornering properties in normal service. The in-service results imply that neither force and moment tests nor vehicle handling tests should be preceded by break-in or scrub-in procedures if the desire is to predict in-service behavior.