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Old 02-26-11, 03:32 PM
  #6  
nwbikeman
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Join Date: Aug 2010
Location: Washington
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Bikes: Serotta Davis Phinney, 1992 Serotta T Max,1984 Specialized Allez, Olmo, 1974 Strawberry,Redline bmx, ect.,

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You might not need to do a full swap. Some of these cranks were drilled for a triple ring, you didn't mention what the crank is but it should take a 39t inner ring possibly smaller depending on the bolt circle diameter of the crank. As for the rear deraileur it will sometimes take a lot bigger cog on the older frames because some frames had a longer distance between the axle dropout and the hangers mount. I have several bikes with a short cage rear deraileur shifting a 7 speed freewheel with a 12-34 and does not bottom out on the deraileur with a double crank. if you have about a 1/4" between the high gear cog and the frame you should be able to mount a 7 speed freewheel to you stock wheel as well.
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