chatelot16 wrote:but i just found that my citroen gs with big and narrow wheel holds a lot better in rain and snow than other car has wider tire
it's very clear for aqua planing! the more a tire is stretched over the water and easy to evacuate on each side
Your GS had narrow tires because they were lighter than current cars.
But if you put narrow tires on the current cars, certainly you will not have any aqua / snow planning, but you will not hold the road so far ...