Quote:
All the formulas I've found online say my Dart with 518OD, 3.91 gears and 26" tires need a 40-tooth gear.
Still, measured against GPS, the speedo is exactly 10% off, both in speed and distance. So I need to get me a 44-tooth gear-unit, which don't seem too commonly found.
With a 26.2" tire the pinion tooth count will be the same as the ratio i.e. a 4.10 axle will use a 41 tooth pinion, etc.
Your setup requires a 39 (or 40) pinion; if the GPS shows your odometer is off that much I'd suspect your measured distance is wrong or your GPS isn't accurate.
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