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Old 01-24-16, 12:15 PM
  #7  
dksix
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Bikes: Basso Luguna, Fuji Nevada

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A 21 speed bike is likely a 3x7 setup (3 chain rings on the crankset and 7 cogs/sprockets on the cassette). The shifters you ask about as 2x10 are designed to work with gearsets of 2 front chainrings and 10 cogs/sprockets on the cassette. If you are trying to replace the shifters on the 21 speed bike it would be best to find a shifter set designed to match the number of chainrings and sprockets you have, likely 3x7.
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