[Gunner]

Not to challenge your expert, but all the books I have on the subject indicate that most big German guns of the period were shod with hard rubber on steel or aluminium rims. A rare few had pneumatic tyres and some WW I retreads still had wooden spoked, steel shod wheels.

I would be very interested in learning more about the subject as it is a huge gap in my knowledge of artillery technology.

Cheers, Mike