In a message dated 6/23/03 10:43:40 PM, PeterJonWhite@PeterWhiteCycles.com writes:
<< Somehow in the far dark reaches of my brain there lurks the image of an outer chainring with a bolt circle that would accomodate perhaps a 40 tooth inner ring, and no smaller. >>
There were 2 other versions of the Cyclotourise "pattern" chainring set . The Randonneur set had a 116mm bolt circle for the inner ring, taking down to 36 teeth, while the Criterium set had a 152mm circle for the inner ring, for a 43 tooth minimum. The Cyclotourise set has a 80mm circle for the 26 tooth minimum size. All of these can be set up as triples, but in the case of the Criterium, one wonders why. In the 50's, apparently there was an outer ring drilled at both 116mm and 80mm for the middle and inner rings, as well as an adaptor set (similar to the Professional adaptor set) with the same bolt circles.