Hi Steve ,
They are easy to make.
What you need is a set of Supastox wheels with the foam removed. ( I soaked them in acetone to remove the foam )
Sweep mini 5 spoke wheels type A. Dremel / remove the spokes so that your just left with the rim. You fit the rim over the Supastox wheels then glue up the tyres.
Best tyres are :
Shimizu Treaded Tyres (pr) for Tamiya Mini - Hard - for the front
Shimizu Treaded Tyres (pr) for Tamiya Mini - Soft - for the rear
Tyres are £8 a pair and the rims £5.50 so not that expensive for a set of tires that don`t chunk and last for ever.
IMG_20161002_135623.jpg
These are made up on JFT rims with sweep slicks. The Shimizu`s are much better on carpet.