Comment by ben_w
1 day ago
IIRC, the difference in radius between fresh tires and those worn down to just before they need replacing, changes the actual speed at any given speedometer reading by about 2%.
C=πD and all that.
1 day ago
IIRC, the difference in radius between fresh tires and those worn down to just before they need replacing, changes the actual speed at any given speedometer reading by about 2%.
C=πD and all that.
Makes sense.
Nowadays you could apply a long-term trim using the GPS speed, including correcting for variations due to steering inputs and elevation.
Mandatory for new trucks and grandfather old ones, like how most new vehicle standards are adopted.