Upgrading to 15' wheel vintiques series 63

Sirensong said

Will 15x7 with either 4 or 4.5” Bs work?

I could got 15x6 up front with 4” Bs and 15x7 with 4.5” in the back.

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With a 15x7 in the back I would use the 4” backspace.

A 15x8 with 4.5” of backspace and a 15x7 with 4” of backspace have the same offset- the centerline of the wheel is in the same place.