Originally Posted by BroMax
Can an internal handle the same load as a der setup? I don't understand how they work but it seems like there can't be much heavy duty hardware in such a small package. I'm shopping now and my semi-finalists include both types of gearing.
In terms of drive train loads and torque, you're fine. In terms of shocks from impacts, I really don't know how tough the 7 and 8-speed hubs are. The Sturmey-Archer AW is renowned for being as tough as nails, so I wouldn't worry about that. The Nexus-7 and 8 are somewhat unknown quantities. I wouldn't worry about it too much. I wouldn't take them on any technical off-road terrain (get a Rohloff for that), but they can probably handle the potholes and occasional curb-drops of urban riding. Shimano would be pretty lax in the design of a drivetrain part intended for urban use if that were not the case.