I have the same sized tires and found a difference of 5mph at 30mph
reading. That comes out to an 8.3% difference. I then calculated .08x40
mph and 45 mph etc to come up with the real reading on the speedo. For a
temp fix I printed up a scale showing reading vs difference and put it on
my windshield as a heads up display.
Then I found the real fix in the Nissan comp manual. Buy a new pinion for
your speedo. They are different for 4speed vs 5 speed but for that size
tire, go up one size or tooth count. If you are running an 18 tooth, buy a
19 tooth. They are available from you favorite Roadster parts house.
John Schmitt Telecommuter Office # - 847-458-7829
Internal phonemail only - 847-240-4725 pager pin# 800-759-8888
pin 8710561
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