fronts are 6.5
back are 6x9
The 2005 Nissan Altima has door speakers that are 6.5 inches. If you are replacing your speakers, you can also use a 5.5-inch size.
Stock rear speakers are 6 1/2" round speakers.
The 2010 Nissan Altima has a 2.5 L base engine size.
They are 5*7 inches
6x9
The 2010 Nissan Altima has an inline 4 engine.
just go to www.crutchfield.com . you can find out there.
If you have the Bose sound system crutchfield.com says the front speakers are 6 1/2" and rear doors are 5 1/4"
Answer 5 1/2 for the rear and 5 1/4 for the front.
they are 6X9 in the rear and 6 1/2 in the doors
6 1/2 in door 6x9 in rear deck
5x7