It is difficult, and the photo quality sucks, but if you look close at the last road wheel, there seems to be the bulged ring characteristic of the steel wheels. Granted, there is a lot of “discussion” on this. Also photos of the other known tank from the Fehrmann group also show steel wheels. Granted, this is not conclusive, but it is all there is to go by. However, the general consensus is that it had steel wheels.
As I stated before, literally every detail about this tank has been debated and argued and to this day people do not agree as to what this tank actually looked like.
A few links into the debate:
Fehrmann Tiger F13 colour debate - Missing-Lynx (tapatalk.com)
Fehrman Tiger question… Please don’t shoot - Missing-Lynx (tapatalk.com)
AFV Modeller - Issue 18 - 2 - Tiger F13 - PDF Free Download (docer.tips)
The tigers of the Fehrmann group (the F13,111…). (forumactif.org)
And some model interpretations:
Even Uncle Night Shift has his own interpretation:
Ken