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I think he has the fiero in wheel with mounted tire. at least thats how I took it. In which case slap them on and measure the gap between the tire and the well and make sure the alignment is still good. If those are all clean then use the larger.
My speedo is off but I just do the conversion. . .its really not that difficult once you do it you can remember most of the important ones.
If the tire is the same profile size and the wheel is larger he gets a larger final drive, which I suspect would just about have to be the case because he did not specify either were wide-wall tires or low profiles so they are probably both hovering around the 55-60 range.
That said if the tires are not already mounted Bruce has a point and I defer to him and then to the first paragraph if they fit.
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