25 pounder rim question

[Wayne Henderson]

The 25 pounder rim has the same stud patten as the CMP rim.
A CMP rim will fit on the 25 but not visa versa as the 25 pdr rim is fitted with wire lugs on both outer surfaces of the rim and will foul against the brake drum and hub.
The correct original tyre size for the 25 pounder is an 8.75 x 16 bar tread, s patten etc but as photos show, and latter directives dictate, road tyres were fitted in the latter war years.
When the 25 is fitted with 900 x 16 tyres it just fits on to the firing platform.
At the Royal Australian Artillery Historical Society, we fit 900 x 16 lug patten tyres to all restored 25 pdrs because of the availability. We even fitted ferret run flats to one particular gun, (army workshop) pressed on and held by the locking rim.