Originally Posted by
Kontact
Dedicated vintage 6 speed chains are wider and not compatible with 7 speed.
Not true. Chains are the same with 6/7/8 speed drivetrains. I use Shimano HG71 chains on every one of my bikes and it's even labeled that way, as are most other "8 speed" chains. All of my bikes are either 6, 7, or 8 speed and I like that I can use the same chain on all of them.