Originally Posted by
operator
It does make a difference.
The effective length of the housing changes if you are using spiral wound as you turn the bars. When did shimano introduce SIS housing? 8 speed? Earlier? I highly doubt you can get away with using 4mm, brake housing as a substitute for 9+ gear systems.
Good winter experiment.
sis housing was on my 6 sp, all original 105. I would think spiral stuff would only make frustrations for anything more than 8 cogs..