Quote:
Originally Posted by Aarongriffey
The method Cas3 wrote above is exactly what the RollsRoyce dealers were doing when I
worked at the Rolls dealer in San Francisco in 1966 and 1977.
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You brought back a memory.... The way I was taught, way back when, was to spray a stripe of paint (silver or white) down the center of the tread (wheel jacked up, spin by hand). Then, using a scribe, spin the tire by hand and scribe a line down the center of the tread. The scribe was a spring-loaded tool that was set on the floor, while rotating the tire by hand. Then, the tape measure method. Always hand-rolling the car forward, before the measurement(s). I've still got my spring-loaded scribe.