This is a post by Cat McClintock on PTC site.
A few years ago, a racing team noted that its bikes weren’t performing up to par. They complained to the bike manufacturer, who in turn complained to the component manufacturer—specifically, SRAM, the iconic maker of bike brakes, shifters, and suspensions (think Rock Shox).
The SRAM team wanted proof that their components weren’t holding up. Everything seemed just fine when they “tuned” the bikes initially. That is, when they optimized their shock absorbers to the manufacturer’s frames. In fact, they suspected the issue might be coming from the bike frame itself.
But pointing fingers wasn’t going to get anyone anywhere. The component maker needed a more definitive explanation for why the racing team wasn’t getting the ride they wanted.