18" Wheel help

OllieDemon45 said
What size spacer would be needed in the rear to run a 9" rim with +30.
Was wondering if it's possible to run this size front and rear but with a 245 or 255 in front and 275 rear.
I don't mind if the front or rear has more "dish" look that the other.
8.75 Housing, BBP, will have 1/2" spring offset.
I have been having issues with my right eye "loosing vision" so haven't been able to do much the last month. Lots of Dr. Appts. but i'm not going to stop the project for now, i've been waiting way too long as it is.
Just making sure i cover all bases before pulling the trigger.

Sorry for being a pain and asking so many questions.

I've got a spreadsheet based on dimensions I took off of my duster that I can plug different backspace/offsets and tire widths. do you know the actual drum-face-to-drum face axle width?

it looks like for a +30mm (1.18") offset rim, a wheel mount face to wheel mount face measurement of 58.5" (stock width for a 93-09? ford Ranger, and you can find ranger 8.8" axles with 3.55, 3.73, and 4.10's with limited slip fairly easily and cheaply) will just about perfectly center the tire L-R in the wheelwell, leaving about 3/4" inboard and outboard clearance. of course, your mileage may vary.

clearance_calcs_275tire_plus30offset_58.5axlewidth.jpg

clearance_calcs_275tire_plus30offset_58.5axlewidth.jpg