Not advised, sincethe threading for the pedals is different between left and right. Depending on tyour cranks, they might already have a left side drive boss, or have a left arm available with the drive boss. Otherwise, you'll have to buy new cranks. Odds are, you'll be able to keep the same bottom bracket. Most (but not all) cranks seem to use 19mm spindles. And, if your current cranks are compatible with profile spindles, you should be able to find just the arms from another brand that will fit your current spindle.
Originally Posted by Jack Burton
When some wild eyed eight foot tall maniac grabs you by the throat and taps the back of your favorite head head against the barroom wall, and he looks crooked in the eye, and he ask you if ya paid your dues, you just stare that big sucker right back in the eye, and you remember what ol' Jack Burton always says at a time like that: "Have ya paid your dues, Jack?" "Yessir, the check is in the mail."