Do half link chains work on any bike and what is their purpose?
From the internet:

"Half Link BMX chains were designed to help dial in the chain length on frames with short dropouts and small gearing, making sure your rear wheel is exactly where you want it. Dan's Comp offers a wide variety of half-link BMX chains for both race and freestyle."

Basically, you can break your chain at smaller increments to get a more precise chain length. 1/2" instead of 1".



Half link chains should work with most single speed set-ups, but not with any bike with multiple sprockets / chain rings.