Join Date: Apr 2008
Location: A Latvian in Seattle
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Depends on what gear range you've got on the rear.
First, make sure you've got a cassette and freehub on back, not a freewheel with gears that screw on.
For casettes, 11t is the smallest (hardest) available, so if you've got a 12t or higher smallest gear on your cassette, swap in an 11t-Xt cassette. Whatever rear derailleur you have should be able to handle an 11t smallest gear.
On the front, you could go with a bigger biggest cog, but remember that you'll need to go up by about 4 teeth on front to get the same effect as going down 1 tooth on the back, percentage-wise. Then you'll also have to deal with re-mounting or replacing the front derailleur, getting a longer chain, and so forth.