Originally Posted by
miamijim
Back in the day when Shimano introduced SG (SuperGlide) chain rings short teeth at specific intervals were a design feature. Specific short teeth help shifting into and out of the big ring.
I've noticed this on the 1990ish Suntour Superbe crankset I have, and on several of the larger cogs on a couple of freewheels in my collection as well.
Here's another photo:
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● 1971 Grandis SL ● 1972 Lambert Grand Prix frankenbike ● 1972 Raleigh Super Course fixie ● 1973 Nishiki Semi-Pro ● 1979 Motobecane Grand Jubile ●1980 Apollo "Legnano" ● 1984 Peugeot Vagabond ● 1985 Shogun Prairie Breaker ● 1986 Merckx Super Corsa ● 1987 Schwinn Tempo ● 1988 Schwinn Voyageur ● 1989 Bottechia Team ADR replica ● 1990 Cannondale ST600 ● 1993 Technium RT600 ● 1996 Kona Lava Dome ●
Last edited by Lascauxcaveman; 04-26-13 at 05:55 PM.