Abus Bordo 6500, in pouch on top tube of my R'off Disc Bike Friday. ... Same keyed the longer link one I can link then for longer reach
(It's carry scheme not as nice as the shorter one)
these are Heavy..

the 6000 is lighter you can buy a 2 pack same keyed, and an 8 link vs a 6 link. for further reach..




also have a security chain & integrated lock, On the Tikit hanging from the bars,,..