depends on what kind of car its on. flush to a civic is like ...15x7.5 w/ +38 offset? not 100% on it, but my 240 is flush w/ F16x7 and R16x8 w/ +20 offset. like hachidori said, its how far off the center of the rim in cm's that the lugs screw on, +40 is 40cm towards outside of rim where it bolts up from the center. hope that helped
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