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Join Date: Feb 2012
Location: Rochester, NY
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Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Mongoose Tomac ATB, GT Bravado ATB, JCP Folder, Stewart 650B ATB
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Sometimes a new crankset is cheaper than 3 rings are. Sometimes a new crankset will need a different length BB. Sometimes the old BB is an OK size for the new crankset but is already worn (and might want replacement soon too). It's an availability and a math problem.
BTW the era of triple chainrings seems to be passing. If you really like this type of gearing (and I most certainly do too) I suggest getting a second, back up, set while you can. Andy
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AndrewRStewart