Originally Posted by JohnDThompson

The Matrix rims were made by Trek. The extrusions were made by an outside company, but they were rolled, pinned, and drilled at the original Trek "old red barn" in downtown Waterloo, WI. and then hard-anodized off-site. They date from a time before rim tension specs were regularly published; for spoke counts above 32H, a tensiometer was generally not needed and wheelbuilders tensioned by "feel."