Hi Kevin,
It is indeed a MR1 micro chassis, any AFX tyres fit. You can also upgrade to silicone. I have Tyco, MR1, AFX, Micro Scalextric, bulldog etc.
Slot cars direct stock tyres and they are cheap. Just search slot cars direct and go to page 2-3 of products.
I have just built a HO Porsche 911, lexan body silicone tyres, non mag 👌💯.
Highly recommended.