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I did the Grand Sport wheels but I had to space mine out 1" to get them away from the Brembo calipers... I can reduce it down to a .5" and get longer studs however im just too lazy right now
Offset is the distance the mounting face is from center of wheel. 0 offset means the mounting face is centered within the wheel. +40 offset means the mounting face (part that contacts the hub) is 40mm from center of wheel toward the outside of the vehicle (when mounted). -40 offset would mean the mounting face is 40 mm from center of wheel toward the inside of the vehicle.
Example: On the same width wheel, 40mm offset would "stick out" more than a 59mm offset. 25.4mm = 1 inch.
With 59mm offset & 12" wheel, 93.4mm is toward the outside face and 211.4mm is on the inside.