The wheels carry the model's weight of about 50 kg/110 pounds in total. The assembly is build from stock parts. The foam rubber, the carbon fiber disc you can buy the materials. It's meant to stiffen up the tyre, and it helps.
The weight conversion I calculated: weight X (scale factor)³. The lathe weighs about 20 kg /44 lb. The working radii measured from the slewing point of the crane: distance X (scale factor). The distance is about 70 cm /27.6 in. The scale of the model is 1/8.
The real crane has the working radii set at 5.6 mts /18.4 ft. The weight it's assigned to is 10,2 metric tons /22528 lb.
Note. The hook block is part of the load and therefore must be deducted from the lifting capacities. It's what the Liebherr factory says referring to load charts.
So I must add the hook block to the lathe. I don't know the weight of the original 4 sheave block, but scaled back to 1/1 mine gives you: 0,937 X (scale factor)³ -> 1 x (8X8X8) = 480 kg. The lifting beam must also be included here. It has its weight assessed from the model without being aware whether or not such a design is used. Well anyway, it counts an extra 153 kg /339 lb. You must add to the payload, 10,2 mt, which works out to 10,2 + 0,48 + 0,15 = 10,8 mt /23876 lb.
The load diagram says it's fine for the 25 tonnes version!