Smuggled tyres are badly bent to fit in other tyre
Although after smuggling tyre walas put them on rims and inflate them full and remove tyre from rim and repack.
After this procedure tyre appears normal but stell belts inside gets distorted hence
When you put such tyres on your car and get them balanced by good technition. Even then these tyres will definitely vibrate at some sepcific speeds (especially at high speeds above 120km/h).
Also One thing i noticed is that smuggled tyres also wobbles at some specific low speeds like brand new smuggled tyre (Advan db v552 on my civic wobbles at 40-50km/hr then remain smooth till 80km/hr then woobles at speed above 120km/hr