Originally Posted by
Maelochs
I had read somewhere that the MTB derailleurs (and chainrings) worked with different spacings than the road rings, so that you would never get a clean shift with an MTB shifter and a road or MTB derailleur on road rings (shifter pulls a different amount of cable.) .
How about this idea then, determine the distance between chainrings on a double mountain set up. Then when you have your compact road chainset duplicate that spacing with spacers by Wheels Manufacturing. They make 14 different sizes, something has to work.
I also wonder if there is a simpler solution than this? White Industries makes their VBC cranks sets for mountain and road. The only difference is the Q factor is wider on the mountain crankset than their road which would mean no difference in spacing.
In the end in may be just trial and error. To the OP please post the final bike when you have it built up. I like your idea of a carbon flat bar set up with wide range gearing.