Originally Posted by DannyRocks
I run a Salsa cross lever w/ shim on my bullhorns, and a salsa cross lever w/ shim + little bit of old tube on my flat bars.
Their originally 31.8 diameter, the 26.0mm shim works fine.
Those old bmx levers are 22mm, they won't clamp onto anything but BMX or MTB bars. The cross levers will get down with anything if you shim them enough.