Originally Posted by Darth Lefty

I believe one of the gigantic (pun intended) expenses of SRAM's highest groups is their X-Dome cassettes, which are not stacks of rings or spiders but instead have most of the cassette machined from a single block of metal, making them as expensive as they possibly could be, but light as can be too. You aren't going to see this any more once it matriculates down the lineup. I bet their supposedly improved chain and tooth shape does make it eventually, though.