The original plan was to go with Wheel Vintiques 10" version of the truck rally wheel for the back to match my 8" fronts, but since they are now a year backordered, I will be forced to go another way.
Coming from the tuner/import world, I am no stranger to wheel fitment, backspacing, and offsets, so I sort of know what I'm doing, but I keep running into the problem where when I find a wheel for either the front or back that I like, Then I can't find the correct offset for the other end.. I've been using Summit's site mostly since it is very comprehensive when it comes to searching.
I figured I would just keep it simple and go with Cragar SS. I love the way they look and they should be readily available and have no fitment problems.
Also prefer direct drill because unilug scares me.. But more on that later.
Starting at the back. 15x10, 5x5 bolt pattern. 4.25" backspacing (The 8" rally wheels I have now have 4" backspacing so these should be fine. 0.5" extra on the inside, and 1.5" on the outside. Great!).
Now for the front, change the search to 15x8 and it gives me these linked below: 15x8, 5x5 bolt pattern, 4.25" backspacing.. https://www.summitracing.com/parts/crr-61c585042/overview/
Now here is where I start to get concerned. These show having a 4.25" backspacing. The current 8" rally wheels supposedly have a 4" backspacing and the wheel is VERY close to the lower control arm. I am very certain that an extra 0.25" of BS would be a clearance issue. Plus I was hoping that I might be able to find them with a 3.5" BS to make the track a little wider anyways (running flares now). Unfortunately it does not seem like they offer with 3.5" BS even if I look at the unilug versions. The next step wider is 2.5" backspace which would stick them way too far out. I see Cragar SS on lowered G20 vans all the time and they all seem to fit and look good. What in the world are you guys running for front backspacing??
I thought for a minute about maybe running a 0.5" or 0.75" spacer up front with the 4.25" BS wheels, but I'm worried about running spacers on such a heavy vehicle. I've done it on cars before, but only used "Hubcentric" spacers which have a centering ring to help keep the stress off the wheel studs and prevent vibration.. Well for 5x5" spacers, most of them do not have the centering ring.. No bueno.
On the same topic about Center bore: The back wheels that I linked to on Summit's website show having 3.580" center bore. Well from what I can find online, my 1985 G20 should have a 78.3mm (3.08") center bore. With normal smaller car wheels, you can get a "centering ring" based on the difference in wheel vs hub diameter and it will fit snugly between the hub and wheel bore to keep everything concentric. Unfortunately I can find nothing of the sort for this application. Do you guys just go without and let the lug nuts do the centering? I do a bit of towing and would really like to keep things as simple and solid as possible..
-Help me out here.. Am I just overthinking all of this?
-I see vans all the time on here with these wheels that look great and I don't find any reported issues.
-What are other good wheel sources or brands I should look at? I'm well versed in car wheels, but finding truck/muscle car/classic wheels is new to me and I'm finding the fitment options to be severely limited