Not sure the exact size, but I believe they are about 1/2" narrower and 1/2" taller than your stock tires. However, despite being narrower, they should have an actual contact patch that is wider. Confused yet? Look at your factory tires and you will see that a lot of the width is in the sidewall and not at the tread and an A/T should have a straighter sidewall and wider useable tread.

If you're looking for a better performing tire but aren't lifted or have the need for larger tires, I would go for it.