Recently I came across a page on Rays Wheels. Below is a figure illustrating how Rays developed their own standards (JWL+R) on top of JWL.
For example, fatigue testing cycles have been drastically increased. And in addition to the JWL-standard 13 deg. impact test, JWL+R drops a
2200lb weight at a 90 deg. angle from ~5.5". And then the
same wheel is used for an additional near
1 million cycles of radial endurance testing
http://www.rays-msc.com/html/jwl.html