Announcing our new "CLUBS" section where you can join or create a Rivian club or group! You can use this new feature to conveniently plan and discuss local events, gatherings or other club/group related topics.
So we encourage you to join (or start) special-interest and regional-based Rivian clubs at: https://www.rivianforums.com/forum/group-categories/clubs-groups.1/
No option there for 305/50/21 . Next closest is 315/45/21 , which come up 1 from PirelliGo enter the size here to see.
https://tiresize.com/calculator/
You'll find that you'll rack up miles on the odometer and your speedo will be off by quite a bit.
You need to goto 305/50/21 to maintain the same OD and keep the speedo accurate.
Also for the wider tires like 305 or 315, you'll need a wider rims and not sure it will even fit within the fender well of Rivian.No option there for 305/50/21 . Next closest is 315/45/21 , which come up 1 from Pirelli
I would still consider putting on smaller tires, but I wouldn't want to stray much for the load rating. It seems like the best options are https://tiresize.com/tiresizes/275-60R20.htm
No. Meaning the diameter of the 20” tire is the same as the OE 21” tire— 33”you mean you can put that on a 21" rim?