You must first take the door panel off, you will see screws by the handles where you pull the door closed and where you open the door. You then must pop off the door panel but be careful not to brake the plastic locks that hold the door to the metal pull easily. Once off you can take out the speakers.
the rear are 6x9...if im not mistaken the fron are 4
is it a 2door or 4 door ?
http://www.madstatic.com/2k1civic/diy/rdeck/
power door or manual
The 1995 Honda Civic Coupe has six and a half inch speakers. Some models in the Civic Coupe series do not have rear speakers.
6.5" http://www.lowrider.com/information/speakerfit/dh.php
according to the walmart site its a 6.5! im pretty sure its is too because it looks like one!
4. An EX has 6 speakers.
http://www.civicforums.com/forums/117-interior/155281-removing-rear-deck.html
The speakers in a 1993 Honda Civic are 6 1/2 inches. These cars can fit 6x9 inch speakers with little to none modification.
To change the rear speakers on a 2003 Honda Civic, start by removing the rear speaker covers using a flathead screwdriver or a trim tool to gently pry them off. Next, unscrew the old speakers from their mounting brackets and disconnect the wiring harness. Install the new speakers by connecting the wiring and securing them with screws, then replace the speaker covers. Finally, test the new speakers to ensure they are working properly.
235/75/22 is the factory size for 2009 Honda Civic