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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As for gearing, the rear derailleur is much smoother than the front, so if you start knocking off sprockets, I'd remove a couple front chainrings before downsizing to one rear cog. In your current setup, you'd only need a bigger chainring if you're consistently spinning out in your highest gear (largest front, smallest back). If your chainrings are removeable and there's adequate frame clearance you could put the largest one in the middle position and lose the rest (you'd need shorter bolts by the way).