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Join Date: Jun 2014
Location: Ontario, Canada
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Bikes: iele Latina, Miele Suprema, Miele Uno LS, Miele Miele Beta, MMTB, Bianchi Model Unknown, Fiori Venezia, Fiori Napoli, VeloSport Adamas AX
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Ah, I forgot about front derailleur cage shape being different for a crank designed for a 24-28-48 set up and one designed for a 22-42 setup. I'd try a 24 chainring in place of the 28 one first. Then if you still need lower gearing I'd get a rear cluster with a larger cog. If your rear derailleur doesn't work with it you can a rear derailleur hanger extender that's inexpensive and will allow you to use your existing rear derailleur.
Cheers