Reply to "How to tell if speedometer is way off?"

bosswrenchMember

Years ago, my wife & I ran T & D Rallys in our '72 Pantera, I ran a 26-1/2" dia rear tire & the speedo was very close; the odometer was dead-on. Smaller, and larger dia tires will give wrong readings. Either measure it or go to the Tire Rack's website, enter the size & brand of tire you have and see what the diameter is. There are a number of calibration schemes including an in-cable gearbox used by cops to calibrate their speedos. The Yellow pages list Speedo Calibration services (t'ain't cheap, though)

2/25/029:22 PM

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