i was curious and if not, tell me why?

 

I rotate mine often enough so they all 4 wear out at the same time.

 

If you rotate the tires as recommended, they should be replaced in sets not pairs.

Most people don't replace worn stock tires in pairs because 1) stock tires aren't good performance wise so nobody wants to pay for a new set and 2) running stickier/better performing tires on one axel and not on the other is going to give the car unpredictable handling characteristics, or 3) they actually rotated their tires as recommended.

If you've worn out the front tires, you CAN just replace the pair. However if you put summer tires up front and stock all seasons in back you may find your rear not getting good traction in tight turns. Depends on what tires you're currently running though. Stockers are not good for traction in any conditionss really so buying 2 new stocks is a waste of $$$ if you like performance.

Granted, after I lowered my RSX, I burned a through a pair of stock michelins in few months due to poor alignment, but after everything was set, all 4 tires were replaced.

 

yea you should rotate them, thatway they last longer and you just buy a set instead of just 2

 

i always replace all 4. however, if you're on a budget, and at least 2 of them have a decent amount of tread remaining, it's not the worst thing to replace just the pair that is more worn.

 

rule of thumb - stick with the same brand as the other two.

 

The best possible solution IMO is to rotate your tires often.
This reminds me, I'm actually due to rotate in a few weeks. h:

 

I replace all four, with an alignment immediately after the new tires are on the car

 

In front wheel drive cars it is recommended to have your two tires with the most traction mounted on the rear.

 

It's based on funds, if you only have money for 2 them get that if possible same brand. That's how I usually do it unless I have the funds for 4 tires. I never heard that b4 because your traction is up front so they should have the best traction, awd mainly front tires, you can have ok tread in rear. The front will do majority of the work. Now rwd is important to have 4 good tires, rear for traction & front for guiding vehicle.