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You’d need to stabilise the rear chainring bolt, with one of those idiotic chainring bolt tools that would almost guarantee that your hand would slip and you’d cut your knuckles on the chainring before the 5 mm Allen key would undo them.
Honestly, whoever came up with the idea of switching the rear bolt to an allen key too deserves the eternal gratitude of the cycling maintenance community.
This is the shittest example ever. You require one extra tool and have three additional pieces of metal than the previous iteration. That doesn’t feel like it is the huge change in complexity you’re making it out to be.