question about wheels

[Vee]

81 K5 blazer, did a search and wanted to verify my bolt pattern
6x139.7mm, is that right? what's up w/ the .7, most of the charts I found online had 5 lug, but mine is 6

also, what's the recommended backspacing. I have a 4" lift running 35x12.50x15's. the wheels on there look a little too tight, I notice some light rubbing on the inside frame up front. I haven't pulled the wheels off to check what they are, but I'm gonna go pick-up a spare soon and I wanted it to be correct

thanks

 

[throttleissues]

Dude, those are 6 on 5.5", tha's why the decimal in metric, cuz it's not a metric rim.
I don't know what backspacing is good on 1/2 ton stuff, but I run 5" backspacing on 17x9 with 36x13.50x17 tires. The width of the rim will affect the centering of the tire, regarding the backspacing.

 

[Vee]

Dude, those are 6 on 5.5", tha's why the decimal in metric, cuz it's not a metric rim.

thanks, that's why I asked I wanted be sure before I went to a tire shop and ordered a wheel - didn't want to confuse the guy behind the counter

 

[AJMBLAZER]

Stock backspacing is around 3.5-4".