I had new front tyres fitted in January. 255/35/R20 97W at national tyres.
I now need new rear tyres. Upon shopping around I notice that Halfords believe that my car should have different sized rear tyres to the front - 295/30/R20
No other tyre garage appears to think like this and I must admit, I have never heard of the requirement to vary the tyre sizes front to rear unless the were exceptions such as towing a caravan, of which I have none of.
Is this actually a thing or are Halfords trying to pull some wool. If they are, why? As the 2 sets of tyres are the same price