Join Date: Nov 2007
Location: Toronto, ON
Bikes: 2008 IRO Angus, 2008 Jamis Exile 29er
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A nice low gear ratio and front/rear brakes and you should be fine.
Depending on how hilly your area is, fixed may or may not work for you. The easier it is to climb a hill, the faster you will have to pedal downhill. Depending on the condition your knees are in, fast spinning may be completely out of the picture, so a low-gearing single-speed may be the best compromise until your knees feel better.