what size SBP wheels can we fit under a rear 1963 fender?

Darter6 said
1964 Dodge Dart with 235/60/15 on 6'' factory steel wheels that I believe are a 3 3/4 backspace. Plenty of room.View attachment 1715355962

View attachment 1715355963

Love those 64 post cars. I was looking for one when I found my 66. I would have to mini tub that bad boy.