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Join Date: Aug 2010
Location: Madison, WI
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I would start with just swapping out the existing 26 up front to a 24 granny gear. That would lower your lowest gears. Then not worry about trying to lower the higher gears.
If you do that, you might find that if you are using your 24T front with the smallest couple of sprockets in back that the rear derailleur can't take up all that chain. But those couple of gears are quite cross chained and it is best to avoid those gears with the smallest front and smallest in back anyway.