RC toys can break just like any other gadget, and if you need some new wheel parts, this might do the trick.
TAMIYA 56528 1:14 Truck Tyres 30 mm Road Profile 1 Pair
eModels
Tamiya Tractor Truck Tires Hard / 30mm 2pcs # 56528
Voltage Models
Tamiya Truck Tyre X 2 Hard 30Mm
Conrad Electronic
Tamiya 1:14 HGV Tyres 30 mm Road Tread 1 Pair