do i have to replace all four tires? had a flat...

[ZEUS]

I would replace all four because you wouldn't be able to rotate the tires so your new two would not have the tread life they could have had.

[circmand]

I would replace all four because you wouldn't be able to rotate the tires so your new two would not have the tread life they could have had.

When the current used ones need replaced the new ones go on the back and 2 bought now on the front