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Re: pic: 2 speed V.3
I would concur that if the drivers can handle it, go for 13-14 fps. Our drivers rarely used all that speed, but they certainly could have. I've driven it at that speed and it is great for me.
The way I see it is greater speed = greater productivity. Just make sure you don't have to downshift to turn, or you may lose that productivity.
Anyway, you can always adjust the sprocket ratios in the end. I haven't found a 8T #35 (only in #25) but a 9T is available and you could always go slightly bigger on the wheel one (I don't know how close you are to the 4" diameter though). 
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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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