"Dave Plowman (News)" wrote in message
...
In article ,
T i m wrote:
and it would be obvious
which is controlling the measured rotation rate of the wheel.

Except it can only be the circumference that impacts the distance
traveled per revolution can't it? Anything else is consequential?

ABS sensors have multiple teeth. If all you needed to do is measure the
speed of the wheel per revolution, one tooth would do just fine.

Except that multiple teeth allow a quicker reading of any change, without
having to wait (potentially) a full wheel revolution before noticing that
something had changed. For ABS, there are big advantages in reducing the
time between the change occurring (ie one wheel spinning faster than all the
others) and being able to detect this so you can do something about it.