Originally Posted by
wroomwroomoops
^^^It would help if you could define what you mean by width.
It's the outside width that's a bit wider. A modern 8 speed chain will work fine on an old 5 speed freewheel, for example, but an old chain that came on a bike with a five speed freewheel would be a bit too wide for a seven or eight speed cassette or freewheel-