CMP tyre manufacturers

[Hanno Spoelstra]

Part 2/2:

"FOR BRITISH WHEELS
9.00 - 16
10 PLY-PLUS
2 SHOCK PADS"

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And this I have never seen before:

"FOR 1 1/2 [degree] TAPER RIM"

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"S2"

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[Mike K]

Originally Posted by Hanno Spoelstra

And this I have never seen before:

I've not seen that marking myself. Interesting it is 1 and 1/2 degrees. When looking at the British divided rims, the two halves have a pretty flat or level appearance, but apparently there is a 1 and 1/2 degree slope there.

The American system has tires that have the steeper bead angle , I believe this follows on from the normal commercial tire designs of that period.

Some people have reported as having no trouble with fitting the newer recently made ( Chinese ) tyres onto the British or CMP rims so it may be the case that some of the individual brands are allowing for the different tolerances. I spotted a CMP at Corowa with the Chinese tyres on it and spoke to the guy at length about tyres , he made no mention of having trouble with the fitting. He drove the truck across the Nullabor all the way from Geraldton.

Apparently the CMP C8A six stud rims will accept anything - US or British.

[David Herbert]

I wonder what "Shock Pads" are ?

David

[Grant Bowker]

This is a guess, maybe a bad one....
Possibly a reinforcing layer under the tread, either extra rubber or belts of cord (keeping in mind that most of the (high profile) tires of that era didn't need belts as part of their structure to remain in shape).

[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 (?).