Wheel offset help, please...
Right now I have a 18x10.5 +58 offset with a 305/35R18 tire and sometime in the future I would like to step it up to a 18x12 rim and a 345/30R18 tire. Right now I have the T2 rear quarters installed and I'm using a 2" adapter (not a spacer) to bring the wheels flush with the fender. I would like to scrap the adapter and use a 1/4 spacer at the most if need be.
The new wheels are only 1 piece and can be made with any offset from +36 to +68.
I have tried to use the offset calculators from the web but it seems like everyone of them gives me a different offset mm so Im asking the experts here for help.
here is from one website...
This one is going from a 18x10.5 +58 to a 18x12 +36 and looks like I would still need to use a 1/4" spacer. Would this work?

Any suggestions or if im completely wrong please let me know. Also if keeping the 2" adapters and making the offset go the other way is a better solution let me know.
thanks in advance,
Brian








