Quote:
Originally Posted by cmpski
I run two sets of of 6X16's on my 67. 15 years ago I had a set of 16's done up to closely match 15's. I've shown my car maybe 50 times and only had two guys notice over all those years. Both sets run 195/55/16's at 24.4 inches. 195/60/16's are the same 24.9 inches as the 205/55/16's but only offer all season and winter tire offerings. My tires have 350 and 200 tire wear ratings. The 200's being the sticky ones. 205's, 811 rpm, 195's, 825rpm. That's only a 2% difference. Your 7's have a 25mm offset and the 6's a 36mm offset. That pushes the outside part of the rim outward to a point that 195's might be your only option with the 7's. Or go 6's with 205's. Or roll the lip which you say is not a option. Your choice.
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205/55 x16 have rev /mi from 821 tp 845 due to varying sidewall stiffness
the associated axle heights are from 11.8" to 12.2"
all Fuchs 7s have ET23.3, I didn't bother to do an average but for a Kumho 205/55 x16 on a 7" Fuch the tire front space is 79mm, this tire actually measures out to 218/52x16 installed w/ 845 rev/mi it is among the shortest 205/55 x16, axle height is 11.9"
installing a 205/55 on a 6 changes the front space to 73mm, and the tire would measure out to be a 211/54 x16 it doesn't materially change the height
the tire would also flex more in cornering, though the distortion is all down near the road, the effect on the chassis interference is unknown to me