swapping wheels for a newb. 18 to 20"

[Mike24jenkins]

Hey all. I have a 2021 Bighorn 4x4 with 18" wheels. I have decided that I want to swap out these wheels with 20"s, but I know jack **** about wheel size, etc etc. Like what is a 20x9 wheel?! LOL

Heres what I would like: I would like to stay with OEM wheels, possibly black finish, 20". I dont want the tires to stick outside of the body. I may get a small leveling kit.

Can anyone fill me in and or possibly point me in the right direction!? Thanks!

 

[MADDOG]

A 20x9 wheel is a 20 inch diameter, 9 inch wide wheel. The OEM 20x9 wheel has a positive offset of 19.05mm.

Your stock wheel is a 18" diameter, 8 inch wide wheel with a positive offset of 19.05mm.

So a stock, OEM 20x9 wheel will fit just fine. If you use the stock tire size of 255/75R20 then the tire width does not change, the tire height (diameter) is 0.1" shorter and the speedometer error is less than 1/10th of a MPH from 20 MPH to 40 MPH, 2/10th of a MPH from 50 MPH to 70 MPH & 3/10 of a MPH from 80 MPH and above.

 

[Mike24jenkins]

A 20x9 wheel is a 20 inch diameter, 9 inch wide wheel. The OEM 20x9 wheel has a positive offset of 19.05mm.

Your stock wheel is a 18" diameter, 8 inch wide wheel with a positive offset of 19.05mm.

So a stock, OEM 20x9 wheel will fit just fine. If you use the stock tire size of 255/75R20 then the tire width does not change, the tire height (diameter) is 0.1" shorter and the speedometer error is less than 1/10th of a MPH from 20 MPH to 40 MPH, 2/10th of a MPH from 50 MPH to 70 MPH & 3/10 of a MPH from 80 MPH and above.

Awesome! Thanks so much!