CMP tyre manufacturers

[Hanno Spoelstra]

This 1939 GoodYear Heavy Tractor tyre showed up recently in a lot of used tyres offered for sale by Bill Ruston

It has that peculiar pattern which I think makes the vehicle slip sideways in certain conditions. AFAIK this pattern was not continued in production later on during the war.

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[Alex van de Wetering]

Originally Posted by Hanno Spoelstra

It has that peculiar pattern which I think makes the vehicle slip sideways in certain conditions. AFAIK this pattern was not continued in production later on during the war.

I remember seeing these in pictures of Morris CDSW tractors..... And I think also on fatcory pictures of 6x4 Leyland or Guy lorries..... But as you say very early war or even pre-war.
I think i have also seen them appear on a 25pdr used as a monument somewhere... But I can't remember where!

[David Dunlop]

That is a very peculiar pattern tyre, Hanno.

If it was possible to mount them on an axle in mirror image of each other, would that cancel out the tendency for the vehicle to side slip in the mud?

With the pitch of all four tyres pointed in the same direction, things could get very interesting on a muddy slope.


David

[Alex van de Wetering]

Originally Posted by Alex van de Wetering

I remember seeing these in pictures of Morris CDSW tractors..... And I think also on fatcory pictures of 6x4 Leyland or Guy lorries..... But as you say very early war or even pre-war.
I think i have also seen them appear on a 25pdr used as a monument somewhere... But I can't remember where!

Found them, Although I now see that the ones on the 6x4 3 Ton chassis are slightly different

@ David. Yes, you would think in mud you would be costantly turning the steering wheel in the opposite direction to counter the movement of the "drifting" vehicle (?).

[David Herbert]

The 3 ton 6x4 in the third photo is fitted with the first pattern of Dunlop Trak Grip tyres. These and the Goodyear and possibly other makes of "diagonal bar" style were very common at the start of WW2 and I suspect that they were a War Dept. design like the various 6x4 standard chassis. I have read somewhere (but have no idea where) that the Dunlop version changed to the later versions with the bars joined at the tyre centre line to reduce side slip in snow and ice and to promote longer tyre life. The more usual Dunlop Trak Grip went through quite a lot of detail changes over the years, particularly to where the tread bars merge into the sidewall. They saved rubber by having a depression in each one, then filled it in again and made the shoulders rounded. This would be a study in its own right.

Early Goodyear pneumatic tyres had a fine diamond tread pattern which became almost their trade mark. When they moved on to newer designs of road tyre they retained the single line of diamonds on the sidewall for many years so it is interesting that the "diagonal bar" Goodyears do not have those diamonds on the sidewall. Is it possible that the one in post #54 is a retread on a Goodyear casing though probably not as the Goodyear Sure Grip in post #44 also does not have diamonds on the sidewall though modern tractor tyres do. We need more examples of this style....

David

[Keith Brooker]

From a tyre manual i have, shows some tyres in use

Last photo of Germans with a tyre from a Guy truck. Photo from my collection

tyre 1.jpg tyre.jpg

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[Mike K]

Wartime 900 13 tyres

[Mike K]

1939 newspaper report

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[Hanno Spoelstra]

Good Year 11:00-20
Road Lug
Made in Canada

For Special Road Service
12 Ply Rating

PS: this tyre is for sale: https://www.generaaltjes.nl/Adverten.../velg-met-band (no connection to the seller)

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