Originally Posted by
wtcc
Yes, the tires that came in the box are mandatory in the Euro Cup (50454). The insert was the cheapest uncompetitive Tamiya has (53113). We mainly race these cars on parking lots and there the tire dies in one day without insert.
I've noticed the same issue without insert. It does seem to calm the car down but without insert the tire deforms a lot after just one race day. This makes tire cost quite high for a tire with very low traction.