Boost Brother

Can one of you guys explain to me the difference between BACKSPACING and OFFSET of wheels??

BassAckwards

Offset is the distance the mourning face of the wheel is away from the centerline of the rim. So an offset of 0mm means the mounting face is the centerline of the rim. A -12mm offset means that the mounting face is closer to the engine side of the vehicle relative to the centerline by 12mm.

Backspacing is the distance of the mounting face to the back outmost side of the wheel. So if you have an offset of 0mm on a 9" wide rim your backspacing is 4.5" because you mounting face is in the centerline.

Boost Brother

Thanks for the breakdown, I really appreciate it. Is there really that much difference between a -12mm and +12 offset? Sorry to ask dumb questions but I'm trying to order rims offline but want to make sure I get the right set up. I like the deep dish look but not sure what I can clear on my truck with a 1.5" leveling kit. Running 305/50/20 Cooper Zeon LTZ on 20x9 Incubus Krawler, how much offset can I get away with just a 1.5" leveling kit? Thanks for the help.

BassAckwards

Well 12mm is about 1/2 an inch so there is 1" difference between -12 and +12.

The tires you are asking about are 31.9 inches tall so a 1.5" leveling kit I bet could squeeze those with 0 offset maybe -12 but if you try to keep your offset positive you will be more likely to fit.

Boost Brother

Yeah, I know it probably better to go with the +12 and be safe but I just don't see that I would be gaining much over just keeping my stocks. I like for it to have some kind of lip and stick out just a little. I wish you could get these in at least a 0mm but I was told my only option is -12 or +12. Im so tempted to go with the -12mm but i dont want it to be too much where i have clearence issues or make it look funny to where its too wide for the height of my truck. I'm so torn.....

BassAckwards

Just go with the -12. If worse comes to worse get a 2" spacer. You will clear the height. It's the width of the tire that may get you.

Boost Brother

I like how you think... But really, if you were me, being very particular about things, what would you choose in my situation?

BassAckwards

Haha I'm very particular about things , I like the lip like you so I would go with the 2" spacer instead of the 1.5" and go with the -12mm becuz the .5" extra lift isn't gonna be any harder on anything so it's worth it IMO to get the wheel you will e happier with. Plus poking that wheel out more will make your wider tire not rub your UCA.

Boost Brother

Awesome... That's what I will do. Thanks for all your help man, I really appreciate it.

BassAckwards

No problem! Here is a pic of my truck to give you an idea of what it looks like I got a 3" lift with 33" tires so its all just an 1" taller than you so it should look about the same. They are 275/70/18 so not quite as wide as your tires but the wheels are 18x9 with -12mm offset.