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The Saint is correct the OEM offset is +48. My issue with the OEM rim for rock climbing is sliding off a boulder and damaging the wheel because the spokes have no offset. This is shown in a you tube video.

My hours of research have resulted in not too many options to test a wheel tire combination forwheel well clearance. A local 4 wheel specialist will order one wheel to try but will not mount a tire.

Tire rack will allow me to return wheel and their mounted tire if not driven on, but their minimum offset is +20. I would try the fit at their pickup center in Denver and not drive on it for an easy return.

Rivian Service Tech says trying to raise the vehicle to off road just for clearance limits the speed to 50 mph, then the Rivian computer will take over and lower the vehicle, whoops. Rivian ST also said that the OEM Pirellis are molded with a camber and that an aftermarket tire will not track nicely on the highway. In other words, the Pirellis are custom made for the Rivian weight and driving modes. This is first hand knowledge from Rivian technicians, not social media.

I sure hope someone actually posts first hand information on their success getting and using a true off road rock climbing wheel and tire combination.
I had my buddy in the wheel industry look into 18", but that failed. 🤦‍♂️Yellow line is a trace of our caliper on a 2D of a 18" wheel barrel.
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gemmisa, Thank you for the graphic. It is beyond my comprehension that your buddy was able to 2 D image of the fit. I always want more, so I am asking if it would be possible for your buddy to image how a 20 inch rim with +20 offset and mounted 275/65R20 in the wheel well and if it will clear?
My main objective is to inset the wheel ribs so that they do not get damaged when sliding off a boulder. The OEM rims/wheels were ill designed for rock climbing. Second objective is grippier tires than OEM. I'm working a tire rack salesman who sold a spare rim/tire mount to a Rivian owner but it was not the specifications of OEM. Hopefully the Tire rack buyer has tested the rim/tire combination and I might get factual feedback. Safe adventures, Mike
I measured how comfortable I was with a 12mm spacer for purposes of testing how close the factory 275/65/20 tire moved to the fender lining. Results below:
Tire Wheel Vehicle Automotive tire Hood


Based on the spacer test fit, I'm looking at a getting a custom forged wheel set: 20x90+43 which is pushes the entire wheel/tire assembly 11mm outward (almost identical to above). Any more aggressive like a 20mm...I would be afraid munching my fender while driving.
 

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@gemmisa nice work! Do you think you can increase offset and run larger tires (285s or 295s) as well? And nice GTR (with te37s?).
295/60/20 (33.9) would be very close in outer dims from the stock Pirelli 276/65/20 tire (34.1).
Load rating of 126 is the same as stock also.

I haven't looked at inner clearance from the tire to air suspension assembly, but I'd still be concerned about the tire getting too close to the fender. Might munch the fender in low mode with a 295 or a 275 with overly aggressive offset.

20" TE37's probably aren't loaded for a truck with a Gross Vehicle Weight Rating of 8,532lbs.
 
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