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Re: Sprockets
What ANSI # or chain pitch are you looking for. #35 is pretty common for FRC. (if FRC is what this is for). However, I don't think you're going to find something that large, at least not in that pitch. A company called Azusa Engineering makes a nice 114 tooth aluminum one (for gokarts) part number 2699-114 which measures 13.829" in outside diameter, has six 1/4 inch holes on a 5.25" circle, and 4.563 ID. If you are going for a large reduction, I believe the smallest sprocket you are going to find is a 9 tooth. This combination would give you a 12.67:1 reduction. 
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Teacher/Engineer/Machinist - Team 696 Circuit Breakers, 2011 - Present
Mentor/Engineer/Machinist, Team 968 RAWC, 2007-2010
Technical Mentor, Team 696 Circuit Breakers, 2005-2007
Student Mechanical Leader and Driver, Team 696 Circuit Breakers, 2002-2004
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