Help with rims

Can anyone tell me how to find out the make and model of the rims that where o my recently purchased tundra?
Tires are 275/65 R20.
Also what is the range of tire sizes that I can fit on these rims?
Thank you,

 

Generally, the wheel markings are on the back (inside) of the wheel. That should give you a lot of the sizing information you need.

 

Thank you!

 

^ This.

Should at least give you the size and the offset..
May look something like this..
18 X 8 wheel with a +55 offset..