Linear bundled wire housing came in with Index shifting, if you want it to Klick shift, that's the way to go..
the top pulley float on Shimano index shifters allow a little mis allignment
Coiled square wire housing was fine for both before that, when precise shifting was a skill rather than a gadget.
Still use that stuff for Rohloff shifter cable sets because its got all the gear sequence selection in the hub.
Last edited by fietsbob; 07-09-10 at 11:05 PM.