offset?

[The_Joker]

What is the correct offset on an 06 GT for a 19x10.5 rear wheel in order to have the biggest lip possible?

 

[RandyB]

What is the correct offset on an 06 GT for a 19x10.5 rear wheel in order to have the biggest lip possible?

It would be in the neighborhood of 45-55mm, IMO. I have a 19x10 wheel with a 45mm and it's real close to flush with the sheetmetal. Figure another .5" to the outside with rim and it might have to have another 5 to 10mm of backspacing to split the difference. Hope that helps.