[Serviceguyuk]

Update

The original tyre you show is a Goodyear Muck Master made by Titan Clickety click

According to the data sheet and scaling down you need a tyre approximately 99mm diameter and 47mm wide

The only thing I can find very roughly about that size with a similar tread pattern is a Lego 32298 which is approximately 107 diameter x 62mm wide Clickety click.

I'm sure a man of your capabilities will find a wheel to modify aesthetically to match your final model. Lego do this to match Clickety click

A little over sized but it's the best I can do with that tread pattern or the closest match I can find

Just trying to help