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thats pretty high IMO
backspace = the amount on the INSIDE of the wheel mounting surface- the rest goes outside. Make sense now?
Yah ik what it is just don't see how rims with a 4" back space stick out 4 inches farther than a rim with 3.75" back space
math is the answer:
8" rim with 3.75" backspace= 4.25" on the fender side
12" rim with 4" backspace = 8" on the fender side