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Old 02-26-10, 08:17 PM
1991 PBP Anciens
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Join Date: Nov 2009
Location: Elburn, Illannoy
Posts: 486

Bikes: 1954 Robin Hood, 1964 Dunelt, 1968 Raleigh Superbe, 1969 Robin Hood, 197? Gitane, 1973 Raleigh SuperCourse, 1981 Miyata 710, 1990 Miyata 600GT, 2007 Rivendell Bleriot

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Originally Posted by Sixty Fiver View Post
I guess I was lucky to get mine for nothing... and the 3 speed conversion gives you 6 extra speeds

Doing the math I would have 9 unique gearings with 10% jumps and a gearing range from 42 to 91 gear inches as I cannot change the cyclo triple cogset from it's 19/21/23 and they also made a double conversion.

A lower cost solution... 2 Shimano 3 speed cogs can replace one SA cog and one could use any decent deraileur for switching duties and in this way you have more choice in cogs.

With a 2 tooth jump the spacing between the 6 speeds is 10%, with a 1 tooth jump it is 6%, and there is no gear duplication... shifting one of these takes a little practice if you want to sequence the gears but I treat them as a high low range.
I have a triple cog set on a 1950 AM that I also got gratis but mine is a 14/19/24 and I'm not so sure it's a Cyclo because of the tooth count. With the AM I have a range of 44.8 to 102.5 with a 46t chain ring. Right now, I'm using a Campy Valentino to move the chain but I have used both a Benelux mkVII and a Favorit PWB. The PWB may be put back to work.
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