Originally Posted by
cycloaptrgangr
Leonard Zinn disagrees with you.
"Yes, chains have gotten narrower as the number of rear cogs has increased in bicycle drivetrains, BUT it is only the outside width dimension that has decreased, and really, we are actually describing the length of the roller pins, which is shorter on 11-speed chains than on 10-speed chains."
oh right, the pins obviously would be shorter by the width of the plates, but the wear portion of the pins, which is the width of the rollers, is the same between 10/11 speed, 2.3mm, which is why the cogs are still the same width.
10L/11R