My lift says 4.5 backspacing what's the offset do ??

My lift says to have a backspacing 4.5" .. The wheels I'm looking at are 4.5" backspacing but it says -24 mm offset dose that mean anything or should I Just worry about the 4.5" backspacing will this wheel work ok

 

Don't worry about offset, just backspacing. With 4.5" BS, -24mm is a 10" wide rim. Why are you wanting to run such a wide rim? What size tires are you planning on?

 

you must be lifted pretty decent (6" or more) for that wide a wheel. Pics?

 

Rcd lift I'm going for looks .. Yes a 20-10"

 

What size tires?

 

Here's some comparo's for you regardless of wheel diameter:

10" wide, 4.5" BS= -24mm offset
--------, 5" BS= -12mm offset

9" wide, 4.5" BS= -12mm offset
--------, 5" BS= 0mm offset
--------, 4" BS= -24mm offset

8" wide, 4.5" BS= 0mm offset
--------, 5" BS= +12mm offset
--------, 4" BS= -12mm offset

 

Was going with 33/12.5/20. But not thinking 295/55/20. ??