Why do Isuzu put inferior tyres on brand new vehicle

<p>Having purchased a brand new vehicle immediately I experienced poor road holding and vibration. Contacted the dealership with very unsatisfactory after sales service. </p> <p>These tyres including the spare were balanced at least three times and I eventually, due to poor service feedback and frustration personally purchased 5 new on road tyres 255x18 which sorted the problem out.</p> <p>In future I will never again purchase any Isuzu product seeing these inferior Continental Tyres make me wonder what other faulty /cheap parts are fitted to the Isuzus. Poor feedback from customer care with a don't care attitude. If only somehow one could complain directly to the director's of Isuzu vehicles.</p>