alright currently at 8" of lift (via Rize).....Bilsteins and lift shackles go on next week for 2 more inches of lift (10" total). I currently have 38X15.50R20 tires with 20X10 wheels and 4.5 backspacing and i rub sometimes when turned and bumps

I want to go to 40" tires next set.....With my backspacing i know i cant run another 15.50 wide tire....

So question is....think 14.50 would work? I know 13.50 would work, but that leaves only iroks...which i dont have a problem with....but theres some other tires out there that i like that are 14.50 wide.....plus i want 40's...not 39.5...i know half a inch big deal...but oh well im OCD haha

any advice?