Low car diet
Join Date: Aug 2007
Location: Corvallis, OR, USA
Posts: 2,407
Bikes: 2006 Windsor Dover w/105, 2007 GT Avalanche w/XT, 1995 Trek 820 setup for touring, 201? Yeah single-speed folder, 199? Huffy tandem.
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The left/front shifter doesn't care how many cogs you have; it cares how many chainrings you have. A double shifter can only handle a double crank. A triple shifter can handle a double or triple.
Mismatched brifters, however, may have different feels for your hands, which might be annoying.