Okay, because I was curious and I'm taken with the idea, even though this cassette is godawful expensive, which supposedly is because it takes 8 hours to make according to some article:


Found a couple websites that say:
* XX shifters and derailleurs are not 1:1 like existing SRAM 9-spd derailleurs. They use the same ratio as Red, Force, Rival. Cassettes, chains, shifters derailleurs all are interchangeable between SRAM road and XX groups. *


So definitely anyone with sram road shifters can run the 11-36 cassette & will have to get the xo rear derailleur.

I know you can interchange sram road cassettes with shimano shifters - so I would say that shimano shifters will probably run this cassette - there is a shimano 29er specific cassette that's 12-36, so I think a shimano mountain bike rear derailleur would clear this cassette - but if not, sram does make an xx 11-32 cassette.


another quote:
As far as shifting goes, the XX shifters and derailleurs borrow the Exact Actuation movement from SRAM’s road groups. That means a) that the cable pull corresponds to exactly the same amount of derailleur movement, and b) that SRAM’s road levers and derailleurs will be compatible with the XX shifter and derailleurs.

http://www.velonews.com/article/92426
http://austinontwowheels.org/2009/06...ountain-group/