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 9.00-16 tyres
CMP trucks have the following wheel & tyre size combinations:
 
Wheel Size
Wheel Type
Tyre Size(s)
Tyre Types
6.00x13"
split rim
  9.00-13
R.F. (Run Flat)
Pneumatic
6.00x16"
split rim
  9.00-16
  9.25-16
10.50-16
R.F. (Run Flat)
Pneumatic
6.00x20"
split rim
10.50-20
R.F. (Run Flat)
Pneumatic
Source: Chev CMP specifications and Ford CMP specifications

This page will focus mainly on the 9.00-16 tyres Dunlop T24 Trak Grip tyres as used on the 15-cwt series of CMP trucks. 

The Dunlop T24 tyre came in three types during WW2:

  • cross country;
  • run flat: with alternate length sidewall lugs, T24 with wartime dates generally have the recessed bar faces;
  • "pneumatic" or  general purpose type: with more rounded shoulders.
All had a 5º bead angle.


T24 Run Flat
 

Shown here is a Dunlop T24 Trak Grip run flat tyre. It has a heavy tread with sidewall lugs. (Variations seen have every other sidewall lug longer than its neighbour, or lugs with a hollow recess on the vertical face.)
This is a post-war tyre, manufactured for the Daimler Ferret Scout Car, but it is very similar to the wartime tyres as fitted on CMP trucks.

Photo courtesy of Richard Notton.


The side is clearly marked 9.00-16 and the tyre is meant "TO FIT 6.50 H RIMS ONLY". 
6.50 stands for the width of the rim in inches - note the 16" CMP rim is 6" wide!
The meaning of "H" is unknown.

Photo courtesy of Richard Notton.


"R.F.H.S.2" denotes this is a tyre for the Ferret Scout Car. Could it stand for "Run Flat High Speed"?
The marking melted in the side is likely to be the manufacturing date, July 1969.

Photo courtesy of Richard Notton.


The side wall is 4" thick, this is what prevents to tyre to collapse when the air pressure is diminished.

Photo courtesy of Richard Notton.


T24 Pneumatic

Here is another Dunlop Trak Grip tyre, a pneumatic (as in non-run flat) type. Note the tread bars do not run along the side as far as on the run flat type shown above.
This type of tyre was fitted postwar to many British army vehicles like the Bedford MW and early Land Rover 1 tonne trucks.

Photo courtesy of Dennis Schneider.


Again, the side is clearly marked 9.00-16 and the tyre is meant "TO FIT 6.50 L RIMS ONLY". Other markings include "6 PLY RATING" and "MADE IN GREAT BRITAIN".

Richard Farrant notes "6.50 L rims are wellbase, i.e. one-piece, and are as fitted to the Land Rover 1 Tonne (101), the tyres for these were 6 ply".

Photo courtesy of Dennis Schneider.


This picture clearly shows the typical Dunlop Trak Grip tread pattern.

Photo courtesy of Dennis Schneider.


Simex ST24/SA24
(link to picture source)
Simex, a Malaysian subsidiary of Dunlop, manufactures  a range of Tractor Steering Wheel Tyres. The ST24 or SA24 comes in 9.00-16 and the tread pattern is (practically) identical to the pneumatic Dunlop T24 shown above. The table below gives the technical characteristics of the SA24:
 
PATTERN
SIZE
RIM
WIDTH
CODE
DIMENSIONS
PATTERN
DEPTH
LUGS
PER
SIDE
PLY
RATING
LOAD
CAPACITY
MAX.
INFLATION
PRESSURE 
MAX.
SPEED
OVERALL
DIAMETER 
OVERALL
WIDTH 
-
-
-
(mm)
(mm)
(mm)
(pcs)
-
(kg)
(bar)
(kph)
SA24
9.00-16
6.00
935
231
17.5
36
6
900
2.30
30
8
1090
3.10
30
10
1250
3.90
30


Other 9.00-16 tyres

Mike Kelly made a list of 9.00-16 tyres and their markings as found on sidewalls of old tyres:

OLYMPIC ROAD GRIP  10 ply rating made in Australia 
Centre Divided Rims Only
Note: Narrow directional bar V tread chevron, manufactured until early 1970's.
DUNLOP TRAK GRIP 10 ply rating Made in Australia
RAYON
To fit American Wheels 
Note: Unusual curved wide bar V chevron, post WW2 manufacture.

Good Year Made in Australia
All Service Sure Grip 
D /|\ D 
Note: wide bar directional V chevron.

Michelin Made in England 
N Type  CC
W /|\ D
Note: curved directional wide V bar tread, found on a Fordson WOT2D.

INDIA SUPER TRACTION
Direction of rotation when mounted on rear wheels > (arrow pointing to closed end of chevron)
Reverse when mounted on front wheels
Note: original WW2 vintage tyres made in UK; two of them are marked RF; tread pattern is different to the T24 Dunlops.


Fitting tyres on CMP rims

Many Trak Grip tyres are marked "For British rims" or "For American rims". The main difference is that one has a 0º bead angle, while the other has a 5º bead angle. Various restorers have reported contradicting experiences fitting tyres to 16" CMP split rims. Some tyres fit without trouble, others only fit with lots of trouble or after grinding the rim or shaving the tyre bead. 
As "the jury is still out on this problem", make sure you read up on the subject before embarking on fitting tyres!


Further reading on the subject

Read some interesting mailing list and forum messages on the subject of 9.00-16 tyres at the:



With special thanks to Richard Notton, Richard Farrant and Mike Kelly for their assistance in compiling this page.

Page created 10 December 2002
Updated 01 February 2003

Copyright © 2000-2003 H.L. Spoelstra - All Rights Reserved