Should I fit new car tyres on the rear axle?
Yes, this is the best advice. The ideal is for all tyres to be replaced at once, but because the front and rear tyres wear at different rates, it is rarely practical. So whenever you make any changes, fit the new or least worn tyres on the rear axle. This is to help maintain vehicle stability in extreme conditions like emergency braking and cornering, especially critical in the wet. It also reduces the potential for punctures to the rear tyres, which make controlling the vehicle more difficult than the same occurrence on a front tyre.