I have purchased the rubico super flex 3.5 lift and am going to run trial ready bead locks that are 8.5 by 17. I am going to run 37 inch toyo mud terrain tires. What backspacing do I need to run. I don't want to rub but I don't want to stick out to far. I am running the ace engineering fenders. If anyone knows let me know. All I can find is 3.75 to 4.5 for 35. But nothing on what to run for 37s. Please help.

 

I run the same tire in 37 in on a 17 by 9 in. rim with 4.25 backspace and do not rub...

 

I'm of the opinion to go for 4.00 or less, as I would hate to end up having to run spacers (I just don't like them). I ended up with 17"x9" wheels with 3.5" backspacing. They do stick out quite a bit (I have stock flares).