20" Ultra Mammoth wheels with 6 1/8 BS and +30 BS, 305/55/20 Toyo Open Country A/T. Is it possible to tell how much further this set up will stick out compared to stock 18" wheels? Will this set up rub at all?

 

need to know how wide the wheel is. if its an 8.5 or 9 wide it should work but you will need a leveling kit. I personally think the 5.5 BS wheels look best.

 

9" wheel

 

they will fit with a 2" leveling kit. Stock hight you will have some rubbing.

 

Any idea how much further they would stick our from the stock wheels? Thanks for the help.

 

factory BS is 6.5 and factory width is 8.5, so not even an inch more then stock.

 

I thought the stock offset was +44 and the wheel width was 7.5". Given those numbers it will stick out an extra 1" or so:

http://www.bigcustomwheels.com/info_specs.jsp

 

my bad i was thinking of factory 20s not 18s, either way you will still be well inside the fender.

 

need to know how wide the wheel is. if its an 8.5 or 9 wide it should work but you will need a leveling kit. I personally think the 5.5 BS wheels look best.

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Last edited by Paralyzer; Yesterday at 08:30 PM.

--A 5.5 BS would push the wheel out further than the 6.5 BS? The wheel I'm looking is a 20X9, either 5 3/4 BS with +18 OS or a 6 1/8 BS with +30 OS.

EDIT: I'm not sure the bolt spacing of the 5 3/4 BS will fit my truck, it's 5.5 whereas the 6 1/8 BS is 135...

 

Yes, the less backspacing (i.e. the more negative offset) will push the wheels out further.

If you have a 9" wheel with 4.5" backspacing, then the offset would be 0. As the backspacing increases, the mounting pad moves to the outboard side of the wheel and the offset increases as well. The stock Ford rims' mounting pad is closer to the outside of the wheel, ergo the +44mm offset. If you have backspacing that's less than half the wheel width, the offset is negative, that is, the mounting pad is more towards the inside of the wheel.

My wheels have a -12 offset, so they stick out a little bit:

 

How much further do those wheels stick out compared to stock 18's?

 

Thank u I was wondering the same thing. looking at some ultra makos in a 18x8.5 with at +25 offset and a 5.73 backspace. on 33x12.50 toyo mts dont want them to stick out to far but dont want then to look stock what do u guys think

 

thats about perfect IMO, you will be pretty much flush with the fenders.

 

Mine stick out about 2" more. The stock 18's are just about perfect flush with the fender flares. These sling a little dirt and crap on the side so I've been considering some mudflaps or bigger fender flares (spendy though).

 

https://www.rsracing.com/tech-wheel.html
Heres a good chart to keep. a 9" wheel with a -12 offset is 4.5" of BS
Im running a 20x9 with 4.5" of BS or -12 offset.... leveling kit and 305/55 TG's