I'm planning to invest into a Alfine 11 set (both hub gear and crank+front cog(45)). I'm also looking for solution for chain guard for Alfine cog for commuting. I've found Curana brand that makes good ...
What are the most significant variables for efficiency of power transfer from cranks to wheels? Chain length? Chain link shape? Chain vs rubber band? Gear shape? Number of gear or chain ...