When sourcing toy car wheels, you must prioritize material composition and dimensional accuracy. For RC cars or high-end toys, rubber tires with foam inserts provide superior grip and shock absorption, while EVA (Ethylene Vinyl Acetate) is ideal for lightweight toddler ride-ons due to its puncture-proof nature. Ensure the bore diameter (axle hole) matches your motor shafts precisely, typically requiring a tolerance of ±0.05mm. For heavy-duty toy trucks, verify the load-bearing capacity per wheel to prevent deformation under weight.