ST-03 Standard Michelin tyre. This tyre is very useful on the standard Tamiya rim

Measurements are: 83mm x 21.5mm.
This tyre can replace the standard Tamiya tyre when they finally dry in and crackle.
The rubber compound used during production, provide to this tyre very high driving calibers, also on ruff terrains.
When you do build extra axles, this tyre is certainly a recommendation.