The answer?
My data shows that 10.50 x 20 Dunlop Trakgrip and Firestone Ground Grip tyres were trialled on 3-ton 4 x 4 WD trucks in 1938 but in 1937 10.50 and 12.75 x 20 Dunlop 90 tyres were fitted to Gilford WD 4-wheelers. So, either 1937 or (definitively) in 1938 is the answer!
The Gilford G.4/3 was trialled in 1936 as an expermental design but lacked performance because of tyre design, In 1937 the gas-producer 4-cylinder version was fitted with 10.50 x 20 tyres and gave satisfactory performance. That is the earliest evidence I have come across so far about these tyres.
Last edited by David_Hayward (RIP); 27-05-05 at 14:48.
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25-05-05, 23:08
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