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Thanks for this, exactly the kind of detailed response I was hoping for and the 5700 option is one I hadn't thought of.
Is the stock outer 6800 road chainring not up to the job? Was hoping to use the 53 from my standard 6800 crankset that is now redundant (I'm swapping my compact between bikes as required at the moment) and a 3/32" chain and sprocket.
onyerbike
Lack of decent chainrings being the main one. For £50 you can get 5700 cranks, your Ultegra left crank will fit on the axle if you want to know how much power your left leg is making and there are plenty of single-ring specific chainrings available in 130mm/5-bolt. If you can't fix the chainline at the hub, you probably do end up having to buy a USE chainring which costs twice as much as the cranks. The other cheap option is to bolt a flat chainring onto some FC-S500/501 cranks for a 42mm chainline. In fact, if you don't need a huge gear and want to run a 3/32" chain, you don't even need to do anything to the FC-S501, just buy the 45T version and you can get up to 90" with a 13T sprocket.