my car is due for its mot and is booked in for friday now the problem is it needs 2 new tires on the front but my local tire centre who have my 17" wheels and i have already paid cant get the tires in til saturday. I have a set of erst wheels which have good tires on but will only fit the rear of the cossie due to the brake discs is there anything in the MOT that says that the rear wheels can not be smaller than the fronts ???

Many Thanks Paul