Well think about it this way. Tyres are the only thing that is keeping your car on the road well. One mistake with poor tyres can at least cause an accident with other cars and pedestrian and even cause a death or someone else and even yours. It is understandable that some people may be tight on money but it is not a good excuse to buy retreads for your vehicle. Just save a bit more or spend a bit more for proper tyres and Im sure you wont regret it.