corunna bird
Well-Known Member
Yeah , I think if it was possible the best scenario would be two have a place to work and a place when your finished. So I guess we are both 50% there. Bruce
That's a lotta tire.
Badass for sure. I didn't catch the plans for rear axle? moved the springs in and mini tubbed, are you narrowing a D60? Or just moving the springs and going with an offset wheel?
Just from my own research on wheel/tire combos for rear on 69 road runners, I came to find that zero offset was the key to exploring the full stock tire width limits on an un altered wheel house and with springs in stock location. In stock form, you basically fill the void between outer wheel house limits and the leafs themselves which were the inner limit. And you centered it between those limits with zero offset.
That being said, I would assume you will want the 7.5" BS (or more), which in theory would leave 4.5" to the outside on a 12" wide wheel.
A 9" wheel will fit in stock form, some have pulled off the 10" with no real wheel house mods other than to maybe roll the lip. But zero offset means 4.5" or 5" out in either case. I don't know how far you moved the leafs in? If you slid them in 2" then I would think you should be able to clear the 7.5" to the inside of hub face, assuming the tire profile on that rim doesn't sidewall bulge a ridiculous amount.
I think you really kind of have to go by offset rather than a "backspacing" measurement when you are threading a needle, so to speak.
"Offset" speaks to true center of wheel. If you look at the particular wheel info you show in your link, the "backspacing" might lead you to believe you are offset 1.5", beings it says 7.5" backspacing... and you are thinking "ok, 12 minus 7.5 equals 4.5, so I'm good, 4.5" out from the hub face, that should clear."
But that 12" wide rim is probably closer to 13" wide total, it's probably 12" wide bead face to bead face.
The "offset" says 25mm (just shy of an inch).
I'd be a little concerned about outer sidewall clearance with this wheel and that big ole tire (running stock rear axle width). It would be like running a 10" wide rim on a bone stock car with zero offset, you'll be crowding the outside limits (I think)
On the outside clearance, you can address the lip clearance by trimming or rolling a bit, but depending on your plans for stance, you will rub on the wall of the outer wheel house above the lip if you plan on sitting the back down over the tires very much.
Take a straight edge and rest it on the lip (pinch weld where outer wheel house meets quarter arch) and you will see that the stock outer wheel wall house tapers in towards the trunk. If memory serves correct, only about 2" above the "lip" the outer wheel house wall is about plum with the lip itself, above 2" it tapers in a bit more. If you want to allow for bump squat or nasty vicious mopar launch squat... or planning on running a bit lowered, the lip is not necessarily the outer limit. The deeper you sink the tire up into the wheel house, the outer wheel house wall itself becomes the outer limit (clearance wise).
I hope that made some sense.... I lack in descriptive writing and talking skills so I tend to "talk with my hands", and you can't see me, so...
lmao!
Love it, great looking car.