Wheel/Tire Help

[4th Gen C-10]

Hey everyone.

I am planing on running these on my 69 C-10 long bed.

https://www.bozeforged.com/doons.html

Plan is 18x8 on the front and 18x10 on the back. Truck is dropped static 3.5/5 with a C-notch. Rear end is original 12 bolt. CPP disc brake conversion front and back.

Question #1: What backspacing should I go with on the front and back? I don't want to have to worry about any rubbing.

Question #2: What size tire should I go with? Looking for a bit of sidewall.

Thanks

[gmc684x4]

67 72 c10 basic tire hight is 28.5 inchs tall

Myself i am looking
at keeping more a stock width tire as well maby a little wider
235 75 15
235 60 18 or 235 65 17 tire

I drive long distances and plan on keeping front and back the same size
1 spare tire to keep

Posi diff does not like two un equal tire sizes

[gmc684x4]

Here is american raciing wheel guide work sheet

https://www.americanracing.com/wheel-measure-guide/

[siggyfreud]

Many people running an 8" wheel (9" wide in reality based on how wheels are measured) run anywhere from a 4.25-5" BS in the front, and 5.5 for a 10" on the rear. That said, your rear may be narrower than some of those running a 5.5BS for the rear, as many of the threads are 71-72 C10s which have a slightly wider rear end.

What I'd do is borrow or buy a wheel mock-up tool and check it out. I borrowed mine from Matt's Classic Bowties since I was ordering my wheels through them, but I imagine there are other vendors out there that loan them out too.

I then had a mobile tire company bring out 3 different sized tires so I could mock it all up. Once I knew what I needed, I ordered the wheels and tires and was pretty confident they'd all fit well.

The wheels you selected look nice. I'm having a hard time getting past their website which looks about 15 years out of date .