Bike Forums - View Single Post - Is there a reason this gearing system won't work?

09-23-09 | 06:16 PM

#25

Jeff Wills

Insane Bicycle Mechanic

Joined: Mar 2008

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From: other Vancouver

Quote:

Originally Posted by fuzz2050

damn, how do you get a 20 tooth great great grandfather gear? That's smaller than even MTB standards will allow.

Well... "current" MTB standards only allow a 22 tooth. Back when Suntour introduced "Microdrive" cranksets, the inner bolt circle was 56mm. This allows a 20 tooth small ring. Later, Shimano introduced 5-arm MTB cranks where the inner BCD was 58mm, limiting them to 22 teeth. Here's some archival info on the Suntour cranks: http://www.bikepro.com/arch_products...our-crank.html

Or maybe he's got a Mountain Tamer (http://abundantadventures.com/quads.html) adapter- this allows a "chainring" down to 16 teeth if you can find the required Suntour freewheel cog.

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