Originally Posted by
dwarner1
Single speed drive trains are said to be more efficient than derailluer systems. I think it's true, but I'd like to know exactly why. Commonly listed reasons include: fewer moving parts = less friction, shorter chains = less chain mass and less friction, straight chainline = less friction(?), less angular momentum change since they don't have to zigzag through the derailleur (?), ,,, Must be lots of opinions about this. List the reasons in rank order.
You pretty much started and ended the thread in one post there. All of that is true.
One extra thing that's true for fixed is that the momentum of a fixed drivetrain pushes your feet through the dead spots. But that's not applicable to ss.