The 139.7mm is the lug nut hole diameter I believe. Offsets are usually +or- 12mm 18mm 30mm. According to Pro Comp lift kits you want as close to "0" off set with a max 5in back spacing. Although MOST wheel companies I spoke with recommended +12 to +18mm offsets.
I have spent some time researching the wheels I just got and I went with a 20x9 "0" offset
Ultra Goliath. I am still a wheel noob though.
Visit pro comps website and go to nissan titan lift kits for the recommended tire/wheel info.
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