Im looking to buy brakes for my 2012 G37 sedan Journey and I see there are a few different sizes to choose from.

Besides taking the tire off and reading the rotor, are there any other ways to tell which size brakes I need to buy?

 

Does nobody even read the various forums??? I am continually amazed when people who have more than one post ask this question. Look at the third sticky in this here BRAKE forum.