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Message: <blockquote data-quote="tplee" data-source="post: 1236797" data-attributes="member: 16148">Sorry, should have asked about offset as well.  What other's have done in similar cases will be entirely dependent upon the backspacing and offset of their wheel vs. yours.  Just asking the question: "what fits, what hits" will not get you what you need.Offset describes where the wheel hub mounting surface sits in relation to the wheel width center-line (e.g. if you have an 8.5" wide wheel with 0.0 offset, the wheel hub mounting surface sits in the middle at precisely 4.25".  With a negative offset (i.e. -1.0”) the mounting surface moves inward toward the inner lip of the wheel one inch, thereby pushing the wheel and tire outward, giving the vehicle a wider stance.  A positive offset obviously does the opposite.However, this is NOT the same as backspacing.  Backspacing describes the distance from the wheel hub mounting surface to the inner lip of the wheel. Both numbers are needed to determine where the wheel and tire sits in the wheel well.In general, OEM offset positions the wheel in the most ideal location for stock tire fitment (as well as a myriad of other considerations).  OEM bead lock wheels measure 17x8.5 with about a 1.37" (34 mm) offset and 5.91" (150 mm) backspacing (according to the 2017 specs; not sure if same for GEN 1’s, but I THINK they are).  What I would do if I where you is build a mock-up out of wood to check to expected problem areas.  You can do this by cutting/stacking wood or other material you can easily shape or cut to size.  If you are running stock tires, these are probably actually around 34.5".  Assuming your new tire is a true 40" inches fully inflated and mounted to a wheel of you specific width (check this! It’s important!) , you'd need blocking of 0.5 x 5.5", or 2.75".  Use HD cargo straps to compress your suspension (if possible) and turn wheel through its cycle, wedging your block in all the tight spaces to check for clearance--or what will undoubtedly be in the case of 40’s, a lack thereof.</blockquote>

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