CMP tyre manufacturers

[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

tyre guy truck ww2.jpg

[Mike K]

Wartime 900 13 tyres

[Mike K]

1939 newspaper report

nla.news-page14218169-nla.news-article128001841-L3-a6e54ae647a42a4b90216541bf8e8457-0001.jpg

[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)

468647808_2741329496255633_706472255700937083_n.jpg 468675368_2741329572922292_1026981559320940256_n.jpg

468755463_2741329432922306_5003775890998552668_n.jpg 468615912_2741329399588976_8891278435062098069_n.jpg

[Hanno Spoelstra]

Photos are for reference - these tyres were offered for sale in the Netherlands in August 2023 for EUR 550,- (since sold).


GoodYear All Weather
Made in Great Britain
img-43244-97674.jpg


9.00-16
For 5 degree rims only
10 Ply Rating
img-43244-97677.jpg


These are sand pattern tyres
img-43244-97673.jpg img-43244-97675.jpg img-43244-97676.jpg

[Mike K]

Originally Posted by Hanno Spoelstra

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

Interesting: The tread pattern on that Canadian 11:20-20 " Road Lug" pictured, is pretty much the same tread pattern as seen on the Chinese made truck tyres that are currently being sold i.e. 900-16.