Good morning Don,
I used to run 205/75/15's on my car. The previous owners had installed
them. They looked closer to the original redlines in profile, but were no
different in rolling diameter than the 205/70/15's (both are less than a 2%
error). The 205/70/15's would give a slight improvement in handling, but
neither could be considered a performance footprint. The 205/70's might
also be a little more common size if you ever needed to find one away from
home, but I'm not sure of that.
R. Ashford Little II
'70 TR6
Riding happily on 215/60/16's
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