18 x 9.5 backspace?

[Izzyhb]

I've got an old 6 lug 2500 that I'm looking to upsize the rubber on.
It's got steel 16 x 8's with 265/75's on it now, but I'm looking to go 18 x 9.5 with 295/75's.
The wheels I'm looking at come either +6 mm or —18 mm backspace.
I'm willing to trim the front bumper edge and the back corner of the front fender to fit, but I don't want to turn up the keys.
Anyone willing to hazard a guess which backspace will be better for me, or if this size will work at all?

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[b454rat]

Check out tiresize.com/comparison. Think that is full address, if not search will bring it up. They have an offset calculator, punch the numbers in and see what the difference will be.

 

[Izzyhb]

That's a pretty handy site, thank you

 

[Will Fuller]

Check out tiresize.com/comparison. Think that is full address, if not search will bring it up. They have an offset calculator, punch the numbers in and see what the difference will be.

Thanks for this