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@Howard
I'd suspect the Octalink design is just as stiff as the 24mm outboard design but a bit porkier. I also suspect its bearings run with less drag out of the box than the 24mm design, it has a lower q-factor (or more heal clearance) and as weight doesn't really matter to track folks it's still a viable proposition.
Or Shimano just can't be bothered to produce a 24mm bearing cup that doesn't have any weather sealing
Also: adjustable chainline.
Awaits Tester