I have an 06 fx4 super crew with a 2"as with nitto terra grappler 305/55/20 tires on stock 20's. would 20x10 moto metal 951's rub? what back spacing would be ok? thanks for your help

 

You should be fine with the Moto Metals if you get the version with 6 inches of backspacing. I believe they also offer the same size with 4.5 inches of backspacing which will be a tight fit and probably require some trimming.

 

The 4.5 bs will stick out more?

 

Right.