New American High-speed Tyre for Express Coaches
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SPECIAL tyres have been developed by the Goodyear 'Fire and Rubber Co., U.S.A.. for the latest express coaches being placed in service by the Greyhound Corporation. These coaches, which operate on through express services between New York City and Miami at sustained speeds of between 70 and 85 m.p.h., are equipped for the service of meals aboard, distributed by hostesses.
The new Goodyear tyres— whk:h are made in the size 11.00-19-in. (14-ply) for this Goodyear application—were tested during the development stage on Goodyear's 500 m.p.h. dynamometer. The tyres arc prestressed. this being done b.% inflating them to normal pressure as they come from the vulcanizer still hot, and then cooling them under stress, • In this way it is claimed that heat build-up can be better withstood,
These special high-speed tyres have white walls to harmonize with the colour schemes of the vehicles, and their manufacturers claim them to be safer and longer wearing than any existing tyre— despite the rising speeds and power of new highway coaches.