The Truvativ HammerSchmidt is possibly the biggest development in bicycle drivetrains in years but it does require its own proprietary shifter. Conveniently, you have your choice of two.
The upper-end Truvativ HammerSchmidt X.0 shifter version is -you guessed it -the HammerSchmidt-compatible analogue to SRAM's venerable standard X.0 trigger. You get the same adjustable pull lever, quick and efficient Zero Loss cable spool, carbon fiber cap, slop-free cartridge bearing pivot, Matchmaker compatibility, and two-position handlebar clamp as the regular X.0 but this one gets a snazzy anvil icon and only has two shift positions.
The Truvativ HammerSchmidt X.0 shifter weighs 113g