18s and 20s tire sizes

[thinair]

I've looked through 10 pages on the google search here and all I really see is answers for the 67-72.

I am a 4x4 guy and am rebuilding a 2wd short right now so this is my 1st go round with tire sizes on the 73-87. I currently have 15x8 and 15x10 ralleys. I was originally thinking 235-70-15s and 255-70-15s but I have been seeing that 255-70s on a 10 don't look that great so I changed my mind to 245-60s and 275-60s.

I have a couple of buddies that are telling me to ditch the ralleys and go bigger. I'm liking the 18/20 combo. My question is........ are 245-45-18 and 295-40-20s going to fit ok on a 4.5/6 drop? 4.5" backspace in the front and 5" in the rear. Will a 5.5" backspacing work on the rear wheels?
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