>>1729926cons:
-sometimes more expensive than derailleur gears, especially high end hubs like Rohloff
-less efficient, though I don't think this is as big of a deal as some people make it out to be
-often fewer gears and less overall gear range than a derailleur setup
-often heavier
-can't shift under load
-need some way to tension the chain
pros:
-often less maintenance
-not as affected by weather and dirt since there is no external mechanism
-can shift while stopped
-chains last longer because they're always running straight
-no der or hanger to get damaged
In my opinion, derailleurs and IGH both have their pros and cons and neither is the best for every person or every situation.
