The Albatross wheels have a nice natural timber colour were they wear on the ground and the rest is a black paint. Its due for a complete professional refurbishment by the museum staff (eventually) not like what happened in the 60's when it was done by a group of enthusiastic amateurs. They will be able to tell what colour the tyres were painted.
Here are a couple of historical photo's of it for your viewing pleasure:
At the factory, and
soon after its capture
It would be interesting to check out the museums Pfalz to see what type of tyres it has. I'll get there one day.