I did it!! 325's on the rear of the 65 dart(barely)

gtmopar said
Thank for the info tubtar I'm thinking I will stay somewhat conservative and run a 305 or 315. I just need to figure out what offset I will need on a 17x11 rim so I won't have to narrow the housing at all. I'll have to do some research and see what I can come up with

Great work on your car. When considering tire size, you need to keep in mind that a 315 tire is not necessarily smaller in the ways you are hoping. When I was doing this to my car, I created the chart below. As you can see, on a 15" tire (BFG ET Street Radial) the 315 is almost 2 inches taller in the car based on the sidewall height. It is also a little wider from a section width perspective then the 325.

Name.....................Size...........Rim..........Sec.......Dia.......Tread
ET Street Radial.......295x55x15....9.5.........12........27.8......10.9
ET Street Radial.......315x60x15....9.5.........13.4......29.8......11
ET Street Radial.......325x50x15....10..........13........27.9.......11

On my car, I am running 315x60x15. If I were to do it all over again, I would go with the 325x50x15 as they are almost 2 inches shorter, which would have solved a ton of issues with tires hitting the front of the fender. It would have also given me almost a half of an inch in width, which definitely helps with the fender lip. Lastly, the car would definitely sit much lower.

I am not sure how well this translates into the 17' rim world, but it may help you some.

Thanks!

OldMoparsRule!