Bike Forums - View Single Post - What was the point of skip tooth chain rings?

07-22-15 | 06:41 PM

#25

FBinNY

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Joined: Apr 2009

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From: New Rochelle, NY

Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter

Quote:

Originally Posted by AlmostTrick

Will a modern 1/2" chain work on the skip tooth chainrings/cogs? Seems like it would.

No it won't, for two reasons.

1- 1" pitch chains are 1x3/16" and so the teeth are too wide
2- the tooth profile and spacing is wrong. As I pointed out earlier, 1" pitch chains have 2 pins and rollers close together and then a wider gap, rather than uniform spacing. sort of like this O O . O O . O O vs. O O O O O. So the two consecutive rollers of a 1/2 pitch chain can't fit between the teeth and likewise the teeth can't fit between the rollers.

Do not confuse 1" pitch chains and sprockets with the skip tooth sprockets SunTour introduced on freewheels a few decades back.

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Last edited by FBinNY; 07-22-15 at 06:44 PM.

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