Sorry to dig up an old thread but just wanted to add my tire experience with the 2. It has the same alloys you guys get with different colors and it had the 185/65s as standard too. I picked up a large puncture within a month of getting the car and though it was fixed, within a few weeks I had a swelling in the sidewall so obviously the tyre needed to be replaced.
Unfortunately I found that the size was not available anywhere in the country as it appeared the 2 was the very first car here to be equipped with the size! So after a bit of head scratching I decided that the best bet was to upgrade the tyre size and change all 4. Found out that I could go to 205/55s so went ahead and did that by getting a full set set of Toyo DRBs and they have really made a difference compared to the old dunlops. The car is quieter and rides quite a bit smoother (I run lower pressures than the rather high values recommended on the door sticker, which seem to be tailored to work with the low rolling resistance dunlops) AND it grips much better as well. As a bonus, the wider tyres look significantly better to my eyes than the skinny 185s.
2016 Mazda 2 Sedan - Black/Black.