When I got my Mitsubishi Pajero Mini 3 years plus ago, the front
tyres and rear tyres were different models of Yokohama. They were
from the previous owners and they look new. So I nv change
then.
But the car rear tyres lose traction sometimes in wet
conditions.
Then I change all four tyres a few months ago to Yokohama Geolander
AT+II for SUV.
The effect is very different!! The traction is good and the
handling was much better. Makes me feel bad why I nv change earlier
to enjoy better handling.
So I feel that its better to have the exact same model and size for
all four tyres. 