Hi,
Of the choices that you suggest, the 205/70-15 is closest to the stock
tire rolling diameter. The 205/75-15 is a tad taller than stock, so your
speedo will read about 2% slower than you're going. The 205/70 is about 1%
shorter than stock, so your speedo always reads 1% faster than you're
going.
Note that 1 or 2% is well within the margin of error for most
speedometers, so the answer is that either tire size would be fine. I have
a hunch that there are more choices out there for the 205/70-15 size.
regards,
rml
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Bob Lang NER/SCCA | This space for rent
Solo Chair 2008 TR6 40 F Prepared | Triumph!
Voice:781-438-2568 FAX: 617-258-9535 | Cell: 339-927-4489
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