There are times when purchasing two tires is perfectly fine for your vehicle. This is especially true for vehicles with staggered wheels where a tire rotation is not possible. On vehicles with staggered wheels, two wheels are often a different size than the other two. This is especially common on sports cars that have wider wheels in the rear for added traction and stability. For vehicles with staggered wheels, purchasing just two tires is normal and will not hinder the performance of your vehicle.