Crupi BMX Racing Chains. Recommended by ACEBMX.
Chains are sold in a standard length that is usually too long.
You therefore half to cut the chain to correct length for your bike gearing with a chain breaking tool. You will want the length to have your wheel about center in the drop out and so that your brake pads can contact the rim braking surface. Make sure the pin pushes back in smoothly and exactly centered like the other pins or use the master link when reconnecting. These chain and most all BMX Racing chains are 3/32" in width. You can run an 1/8" chain on 32/32 chainrings, but 3/32" would be better.