Originally Posted by Paulramforum
Okay - I will apologize for the long post upfront - but I am ready to finally pull the trigger and get wheels and tires. I have read Brandon's guide and so many post on the forum website it's enough to make my head spin!! It is all very educational and helpful but also makes me question myself by reading so much information.
I am not an expert on this stuff so I appreciate any input.
I am considering Fuel throttles in either 18x9 or 20 inch. I currently have the 20 inch chrome clad stock wheels. (The stock tires actually measure out the 32 inches high). I have Bilsteins set to 2.1 on the front and stock rear. I am considering either BFG ATKO 305–65–18 or 285–65–20. bFG says the 18 inch tire has a 33.7 inch diameter and the 20 is a 34.7 inch diameter.
It looks like the 18x9 inch wheels will actually give me more sidewall. It looks as though 20 inch wheels will give me a bigger overall tire but a smaller sidewall.
Fuel offers the wheels in either +1or +19 offset. It doesn't matter the size. They also make a comment on their website that the lip size is 1.57" regardless of the backspace. I'm not sure I understand how that can be unless they add material to the back somehow?
My questions are:
From what I researched it looks like the +1 offset will stick out less than 1 inch further than what I have now. However it looks like the tires are also wider than what I have now so does that add to the 1 inch also?
Also what is the advantage going to a 10 inch wide wheel? Is there one? All the 10 inch wide wheels have negative offsets...not sure how that fits in.
Should I be considering other sizes?
Do the BFG tire measurements stay true once mounted?
Aam I missing something?
Thanks for the forumz thoughts and education!
You are correct that the difference between the 18 and 20 inch wheels is the amount of side wall you have. There are more sizes than a 305/65/18 and a 285/65/20 though... I wouldn't limit your choices to that. The full spec list can be found HERE
. What your decision really needs to start with is whether or not you want an 18" or 20" rim. There are many tires with different overall sizes that will fit onto them.
If you stick with a +19 offset you're limited to a 285 wide tire to guarantee no rubbing. The +1 offset is a lot more common on leveled Rams as it provides more options for tire sizing. It will be sticking out 0.75" more.
You are correct in them adding/removing material from the mounting surface of the wheel to change the offset as well. The lip depth will be the same no matter what.
The advantage of a 10" wide wheel is a deeper lip, that's about it. With a 10" wide wheel and a negative offset you will definitely be sticking out further as well. With the tire sizes you're talking about I'd be staying with a 9" wide wheel.
Yes you should be considering other sizes as I mentioned above.
The spec sheet I've provided shows the overall measurements of the tires when mounted.