Hi Craig,
Mate thanks for all your input, you have really helped.
I measured the calipers last night, and the calipers only hang about 40mm past the rotor, which brings it out to about 370mm, so even if it was 80 mm past it still clears. The clearance with 18" at Simmons is now 435 mm, and the 17" are 395 mm, so I am assuming that they using different rims sizes.
Going with the following rims sizes, I think the offset would be
Front: 8" - 2.5" = 5.5" (140 mm)
Rear: 10" - 2.5" = 7.5" (190.5 mm)
Offset would be:
Front: 1.5" (+38mm)
Rear: 2.5" (+63.5mm)
I may actually understand this.
Now that would be a first
