Hi, I’m an optimist and I want to have my summer tires mounted again on the weekend. I measured the tyre profile of the summer tires today and became thoughtful. I have front R and back L just over 5mm. Front L and back R just under 4mm (at the side a little less). All tires are of the same brand. Can I mount the old front R and back L on one axle and the two 4mm back or should I replace the 4mm? What’s your opinion?