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Would be a great time to change out the internal speedometer ring gear if I needed to.
For what it's worth:
The number of teeth for a correct speedometer gear (the one that goes into the tailshaft, not this ring gear) is:
Gear teeth = (Ring Gear teeth * Tire RPM * Final Drive) / 1000
So my 31" tires have an RPM of 661 (calculated for 30.5"), my final drive is 3.00, and the blue ring gear is an 8 tooth.
Gear teeth = (8 * 661 * 3) / 1000
Teeth = 15.8, or a 16 tooth gear.
If it'd been something like 15.5, I know my speedometer would never be correct, and a 9 tooth ring gear may put it closer.
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