My "new" '74 Duster- or why I need a project like a hole in the head
Yeah...I think 275 is a bit much for me. Maybe I'll run a 235 or 245...
I want a 275 front tire bad.
But when I step up to an 18x9 wheel I will probably start with a 245/40R18 and see how they fit is on my car first. Partly because I see the 245/40 all over the place used on Marketplace and I have seen exactly one 275/35R18. So something cheap that I am pretty sure works seems like a better gamble than jumping right to the 275 and maybe needing to massage some sheetmetal right away. I expect to do some massaging at some point, but nice to take it in smaller chunks.
The other reason I am looking at a 245/40 first is the source for 35-38mm offset wheels seems really small. I found an 18x9 +30mm wheel I like for a price I am comfortable with and figured I would start there. Worst case, having the wheel widened 1/2" in the back would push the offset back to about +36mm. Can't say it would be cheaper than buying a wheel with the right offset to begin with, but it's just an idea right now.
The other factor I have to be careful of is that I need to make sure whatever 18" wheel I pick will work with my homebrewed Brembo kit. Most manufacturers don't seem to have much to say about it, so I have been focusing on wheels that might fit a 2009 GT500, which is why I am leaning towards the AM 2010 GT500 wheel. Others might fit, but not ready to order one and hope I can send it back if it won't work.
Add that my hubs are already machined to match a Mustang hub (outside of issues with the depth of the hub) and it makes some sense to be looking at wheels that would fit a GT500.