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@Emyr
I'm always worried by the tiny surface area the torque passes through between the chainring and the splines.
I'm pro-external, but I need to swap my RaceFace EvolveXCs for some shimano chanks - RF use a driveside self-extracting crankbolt which means as soon as there's the slighest bit of play, my fixie kicks forwards and back will work it looser. Also, the bolt is soft as fuck. Driveside bondage ftw.