Been searching and searching forever and still cant find an answer...

What is the backspacing on the stock SR5 wheels of an IFS truck?

Ordered some pro comp rock crawlers with 4.5" backspacing, I want them to stick out just a tad and wondering if they will.

Does any one have a picture with a 15x8 rim with 4.5" backspacing mounted on a 2nd gen? Thanks

 

Here's a 4.5 backspacing 15x7.5 on 31.10.5s.

 

Those rims just barely stick out, maybe an inch or so. The rims are perfectly sized for 10.5 width tires, in my opinion. Just try not to run any tire thinner than 10.5.