I think you would do damage to the axles with 2 different size wheels on it.
I just put brand new 20" rims and tires on my 03 4wd Tahoe that I bought new at Selman. Something I didn't think of was the 17" spare. I primarily use this car for Havi and Mammoth. Will the spare be ok if anything happens out in the middle of no where.
I think you would do damage to the axles with 2 different size wheels on it.
The overall diameter of the two FACTORY tires 20" and 17" should be the same....