Hi guys, I have a customer that wants the widest tires (like Drag Radials) and 8"- 10" wide 15" rims to go under a STOCK 68 Dart with 8.75. He does NOT want to mini tub or relocate the springs,but does plan to put SS springs on later he said. The car is not here to get measurements. You guys are always helpful and very knowledgeable, Greatly appreciate any info with tire sizes and offset/ backspace. Thanks in advance

235/60-15 on a 15x7 wheel with 4-1/4" backspacing should fit without doing anything to the car. A wider tire may be possible, but then you may be looking at rolling or trimming the wheel opening lips etc.

SS springs may elevate the back of the car enough to get a 245/60-15 in there.

My friend has 265-60-15 on 8 inch rims on his 69( not sure of offset),but with offset spring kit,you can go wider.

255 60 15s fit without moving the springs

I second this