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In Reply to: speedo posted by michael on February 12, 2000 at 08:01:36:
: my speedo reads 10 mph faster than reality. anyone have a fix?
Easiest way is to shorten the tires by using lower aspect ratio, like change from 205/70 to 205/60. You can compute the circumference of the tire that way and figure what you need for new tires.
For example, 205/60R15 works out like this:
205mm x 60% is the height of the tire section;
divide by 2.54 (mm/inch) x 2 (both sides of the tire) + 15 (the wheel)
=24.7 inch tire diameter
Yeah, I'm an engineeer (how did you guess)
As a bonus, the shorter tires will also work like a higher ratio differential for better acceleration.
It worked for me.
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