RK 3.5 / 4.5 X-Factor Mid Arm System

NTX Black Moab

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Tom
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DFW, TX
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2019 Jeep Moab (Black on Black)
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@Rock Krawler Suspension

Looking to do either a 3.5 X-Factor (http://rockkrawler.com/jlu-3-5-x-factor/) or 4.5 X-Factor (http://rockkrawler.com/jlu-4-5-x-factor/). The tire fitment for the 3.5 and the 4.5 are the same. Copy / Paste error? I would assume an increase in height would afford me a taller tire (assuming Sahara OEM fenders).

Also, the Wheel Fitment is recommending 3.5" of back spacing. There aren't a lot of options with 3.5" back spacing, but plenty at 4.5". I know I've seen a lot of people run 4.5", but don't know if they're doing that with spacers or not.

So my questions:
Can I run a taller tire with the 4.5 X-Factor versus the 3.5 X-Factor?
Do I need to run 3.5" of back spacing? Or will 4.5" be ok? Or is 4.5" only good with spacers.
 



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