Back spacing on factory SR5 and TRD Off Road wheels?

Does anyone know what the back spacing is on the 16" aluminum SR5 wheels and the 16" TRD off road wheels? I have the SR5 wheels currently, but like the look of the TRD OR wheels better. I want to know the back spacing of each, because I plan to buy a set of the 4" lift spindles, and wanted to know if I would need to run wheel spacers, and / or what size of wheel spacer. I'm wanting to run the thinnest spacers possible, just enough to keep them from toughing the spindles, but also to hopefully keep my wheels from sticking out past the fender flares.

 

Both have a 5" backspace.

 

@splitbolt thanks for the data, but I do not see the figure for the 5" back spacing. Can you explain how you determined that from the information provided in the table?

 

7" is only the (inner)rim width...
8" would be the actual (outer)wheel width.
You have to account for the thickness of the wheel flanges when figuring backspace... usually, 2 x .5"=1"
So...
8" w/ 0 offset would be 4" BS
...add 25mm positive offset; 5" BS.

 

Thanks for explaining it! Now those figures make sense. Learn something new everyday lol