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speedogear.jpg Using the mfr's diameter in [url=http://moldyrabbit.com/liquid/speedo_gear.html]Liquid's calculator[/url], the gray 19-tooth gear in the car should be correct, but the speedo showed ~9% high.  Using the tire's rolling diameter of 25.79" (back-calculated from the RevsPerMile), it recommends the orange gear.  But even after installing the orange gear, it's still ~4% high at highway speeds.  Below 55, it's dead-on.

[url=http://www.supermotors.net/registry/media/739754][img]http://www.supermotors.net/getfile/739754/thumbnail/tires16st.jpg[/img][/url]

The drive gear in the transmission tailhousing has 8 teeth.
speedogear.jpg | Hits: 3065 | Posted on: 11/28/10 | View original size (371.13 KB)

Using the mfr's diameter in Liquid's calculator, the gray 19-tooth gear in the car should be correct, but the speedo showed ~9% high. Using the tire's rolling diameter of 25.79" (back-calculated from the RevsPerMile), it recommends the orange gear. But even after installing the orange gear, it's still ~4% high at highway speeds. Below 55, it's dead-on.



The drive gear in the transmission tailhousing has 8 teeth.
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