Quote:
Originally Posted by trebuchet03
I remeasured, and noticed a chamfer on inside the tread valley (I guess to reduce stress concentration).... My caliper was resting on the chamfer, not completely seated in the valley... Measured from the center of the valley (not on the chamfer) - everything is nominal...
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I'm guessing that by chamfer you mean the 2/32" high wear indicators molded into most tires.
(I believe US DOT requires them in passenger car tires.)
Example 1
from
Tires, Page 3 of 4
Example 2
from
Checking Your Tires for Wear - For Dummies
FWIW - I prefer a standard tread depth gage ($2-$3 from any auto parts store).
The compact design makes it easy to use in the wheel wells of most passenger cars.
