Page 2 Advertisements Column 2

Oamaru Mail, Volume XLIV, Issue 14008, 12 March 1920, Page 2

HARD OR SOFT TYRES? '-.There is a good .deal of dquiji', amongst road transport engineer:-, whethe'r the solid rublt'cr tyres used o.i the majority of commercial vehicles should be. hard or soft. Some-.enghseers advocate hard t.vrcs —the harder the better —and others are in favor ol soft tyres; and there are still others who hold that the choice depends • upon ' the condition of the roads and the design of -the/vehicle, especially in relation to its springs. It. may seem ' .curious that: tliis point has not already been cleared up, but the reason is simply that with the usual mechanical- 'drive -.'from a petrol or steam engine there is no means of determining the exact amount of energy supplied to the wheel. Until this is known, the relative efficient cies of different hardnesses of tyrec-aii-not be more than guessed at. _ With electric vehicles the case .is different, as the»amount of current used can be measured to the minutest fraction..r.nu the efficiency of the motors and other parts of the equipment is fixed. Therefore, "the Electric Vehic-Je Committee of Great Britain recently decided, -to organise a. series of thorough te;. ts to bring the .matter -'to a conclusive issue. These tests will bo of great,: value to the motor industry/in all parte ot tiie world.

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