Originally Posted by
tommymc
As 10-speed gear has now taken a backseat and is priced accordingly are there any downsides to using 10-speed chains on 5, 6. 7, 8, or 9-speed clusters? Or even on a 3/32" SS setup? It would really simplify the garage inventory to have one type and not need a magnifying glass to check link markings. I also have the impression that the available 7,8-speed chains are not of the same quality as currently made stuff.
9+ speed chains are 11/128" not 3/32" and may not fit your fatter cogs.
Downshifting your front derailleur, the narrow chain can get stuck between the rings.
The thinner chain isn't going to shift as well.
Finally, less contact area between the thinner side plates and pins means narrower chains wear out faster.