-- Peter Jon White <lists@PeterWhiteCycles.com> wrote: > I think the 122mm width was to accomodate the > "Ultra 6" Suntour freewheels.
Here's my theory about the 122 and the 128s. (I don't remember 128s but that doesn't eman they weren't made.)
Most Italian frames were built for use with Regina freewheels, which were a couple of millimeters thiner than Suntour's. Consequently, there was less space at the point where the right side seat stay met the dropout. If you used a Suntour freewheel with such a frame, the chain would rub the seatstay when it shifted between the small cog and the next cog. The solution was to add a couple of millimeters to the hub width so that the outside face of the freewheel was a farther away from the inside face of the dropout. This would be a 122mm hub width for 5 speeds (or Ultra-6) and 128mm for 6 speeds.
Anyway, that's my theory. Best regards, Fred Rednor - Arlington, Virginia
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