Dunlop Produce Tubeless Tyre
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EXAMPLES of the first range of tyres L. to be manufactured in this country in which the outer cover also forms the air container, were demonstrated by the Dunlop Rubber Co., Ltd., at Fort Dunlop, Birmingham, last week, The tyres are available in sizes from 5.00 by 14 in. to 6.50 by 16 in., and are marketed at a price equivalent to that of the corresponding Dunlop cover of the standard type, plus 20 per cent. The possibility that the tyre will eventually be available at a competitive price is envisaged The overall weight is increased by about 10 per cent.
The tubeless tyre can be fitted to any modern type of wheel, an air seal being formed between the bead and the rim. The cover has an inner lining equal to the thickness of an inner tube, and under the tread there is a puncture-seal layer of special composition which prevents the escape of air when the tyre is penetrated by a nail or flint. Because the lining is not under tension, pressure loss is reduced by approximately 50 per cent, and damage from underinflation is less likely.
A valve with rubber sealing washers is supplied which is fitted in the aperture of the inner-tube valve. The tyre is unsuitable for use on multi-piece rims. Normal fitting methods are employed, but the rims must be free from dirt or paint blisters.
During the demonstration tests were made to show that fast cornering could not cause air leakage.
TURN BLIND EYE—M.o.T. OCAL licensing authorities have been recommended by the Minister of Transport not to take proceedings against owners of agricultural tractors or farmers' goods vehicles taxed at preferential rates, if they are used in publicly organized Coronation processions. Vehicles must, however, be covered by insurance against third-party risks while being used in this way. B5