Duncan Bath wrote:
> Forgetting for the moment that it was not legislated, the automotive
> adoption of SI was not done in one blinding moment. As a matter of fact,
> some items (say, tires) still carry a whiff of non-SI.
Wheel diameters are non-SI (or, at least, only soft SI) worldwide. Tire
widths are SI and tire depths are implicit (e.g., 205/60, meaning 205 mm,
with depth 60% of width).
Imagine what it would do to tire inventories if wheel diameters changed to
hard SI.
History definitely limits us (relative to the ideal) in many cases.
Bill Potts, CMS
Roseville, CA
http://metric1.org [SI Navigator]
