Stock rear speakers are 6 1/2" round speakers.
6 1/2 round
6 1/2 inch round
6x9
6.5"
6.5 inches
The rear wheel hub spindle nut (axle) size is 30mm. I just changed my rear wheel hubs today
the door speakers are 6.5 and the rear are 6x9
a 6 1/2 speaker fits in the door of a 2006 nissan altima
The 2001 Nissan Altima has a 2.4 L base engine size.
The 2001 Nissan Altima has an inline 4 engine.
6 1/2 or 6 3/4 inch in the doors and the rear deck
Door speakers are 6.5". Rear speakers are 6x9".