Join Date: Aug 2005
Location: Pittsburgh, PA
Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
Mentioned: 4 Post(s)
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Quoted: 180 Post(s)
Are you discussing the cable housing or the inner wires?
If the housing is the issue, yes new 4 mm housing will work fine in place of the former 5 mm housing as long as it stays in the frame stops.
If the inner wire is your question, as long as the cable ends fit into the shifter recesses, you are fine.