HalfLink chain 

Halflinks stretch crazy fast - removed 4 half links within 3 months - thats 2" of stretch!!! Totally wrecked my cogs and chainrings - tried a few brands - ALL did the same.

@@mattvanderwalt6220 Dang, so nothing but downsides. lol. They look cool at least.

@@BigBeezyBtown Yeah they sure do. I thought they'd be awesome for my SS builds... But for me the insane stretching is a definite fail

Most bmx specific chains come with just one half link now. Best of both worlds.

@@unkepthurdle3233 Or literally inserting the weak link... ;-P I get the reason - but not going down that rabbit hole again. I've used esp. reg KMC Z chains and yet to notice any stretch. I'd rather fiddle with cog teeth for chain length than use a HL chain.

I would say Yes. Shimano, SRAM, KMC and others make a different master link for the different speed chains. SRAM even has two different master links for 12 speed depending if you have an eagle or flattop.