From what I can find out, it seems to be 6.5".
They are 165mm size
The rear speakers in a 2002 Nissan Frontier measure 4 inches and are located in the back doors. The front door speakers measure 6 3/4 inches.
11.9
6x9 component in the front, 6.5 rear door.
The 1998-2004 Nissan Frontier takes 19" replacement windshield wiper blades on both sides front.
2000,nissan frontier speakers size-------6 1/2 Try to use the Nissan speaker adapters plugs so you don't need to cut wires and mess up the electric system, you can get those from eBay or amazon.
front 6x9, rear 6.5
6-1/2
The 2010 Frontier have 3.5 tweeters (Front dash) 6/9 front doors and 6.5 in rear door.
The 1998 Nissan Maxima rear speakers measure five inches by seven inches. There will be to rear speakers, one speaker on each side of the passenger cabin.
6 X 9 on the front doors and 6 1/2 on the rear.
The 2013 Nissan Frontier has a 2.5 L base engine size.