Tire size 205 60 15. checks good with GPS speedometer with the car speedometer.

195x65x15 is another size that works well. Both sized typically fit under a stock narrow body with 2.0 Fuchs.

I run 205/60 15's. My speedo reads about 7% fast. I've actually swapped 5 different speedos to check this. They all read the same. If yours reads correct with those size tires, your speedo is off, or has been readjusted.

Curt
It checks against the GPS on my phone. If it is correct it will be the first thing on the car that doesn't need tweaking.
Brian