Join Date: Nov 2005
Location: NW Ohio
Bikes: 1984 Miyata 310, 1989 Club Fuji, 1986 Schwinn Sierra, 2011 Jamis Quest, 1980 Peugeot TH8 Tandem, 1992 Performance Parabola, 1986 Ross Mt. Hood
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On the Cannondale, the aluminum frame may not like being squeezed down to the normal 110mm spacing that is normal for 3 speed hubs. You would need to make sure that you get a longer axle so you can add spacers. Sturmey-Archer made a long axle, so you should be able to find one.
I built a three speed from a Kabuki frame and a Shimano hub. I laced new alloy rims from Nashbar, but everything else is original. The ratios are spaced out, but I have 44, 59, and 78 gear inches using the 39 toooth chainwheel and a 18 tooth cog.