Originally Posted by
Sy Reene
I believe it's more correct to say that external cam skewers require more force to close in order to achieve the same clamping power as an internal cam skewer, but if you're not strength limited, either type of skewer can provide adequate clamping force.
I'm not sure they can in a practical sense. Most external cam skewers have plastic cam seats and weaker lever pivots. They are made for light weight rather than strength. The lever force needed to equal the clamping force of an internal cam skewer would probably break them.