basic physics. The test he keeps referencing is comparing wheels that weigh from 17-20 lbs, which most track fiends would consider to be lightweight track wheels. You're throwing in 5 different types of apples and stating they all taste slightly different, but not by much. They're all apples; we're talking about apples and oranges (oranges being actual heavy wheels, 21+ lbs).
Cheers, JBrobst
"A life spent making mistakes is not only more honorable, but more useful than a life spent doing nothing." George Bernard Shaw