I have a BMW E53 X5 2004 3.0i Sport with 19 inch rims. I have 285x45x19 tyres on the rear and 255x50x19 tyres on the front.

I have been offered a set of four 285x45x19 tyres at a really great price. is it possible to put these on all four wheels or do I need to stick to the narrow tyres on the front?

I think the stock wheels are 9J x 19 ET 48 on the front and 10J x 19 ET 45 on the rear but I have not checked mine yet.