Thanks to @Cale reaching out to Rivian, we now know that the bolt pattern Rivian uses is 5x5.5
That's odd I didn't realize the configurator did that. Which vehicle were you trying to spec @BillyRBell? Also, welcome to the forum! Thank you, seems like a great forum to be a part of! Configuring the R1T. Launch edition, of course. Added the out door kitchen too, but yeah only the different...