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Re: Speedometer lying at high speeds?
In a message dated 9/25/99 7:03:41 PM Mountain Daylight Time, firstname.lastname@example.org
<< Their accuracy
depends greatly on the rolling circumference of the tires, and that
varies from brand to brand even if the tire size spec is the same.
The degree of tire wear also influences the circumference (more than
you might think). Add different-sized after-market wheels and tires and
there's even more variation. >>
Bigger means slower though so his Speedo would read low not high.
87 4000 CS quattro (Speedo Calibration right on when driving past trailer
with speed read-out)
85 Quantum GL5 (Speedo is 5-6 mph fast when going past at "30" mph yet is
right on at "65" MPH? Maybe not though top speed in all gears is higher than
the owners manual says by almost 7mph.)
73 Beetle (Does the Speedo even work?)