Greets from Florida, I just bought a '94 XJ12 Chevy 383 conversion, and I'm looking to put 18" wheels on it. Stock height and suspension, not lowered or anything,at least not yet. Looks like the stock 16" 20 spoke rims have a bore of 74mm, offset 33. Will 18" 8" wide 40mm offset require spacers to not rub? Tire size recommendations?
Here's a few pics of my ride.
i also have a 2001 XJ8.

 

I went with 18" x 8", 35mm offset. The crucial part is the centerbore. must be 74.1mm or larger. 245/45 18" filled out the wheel wells nicely.

 

KMC Newton tint

 

That looks pretty good.