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Unread 19-12-2013, 05:50
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AKA: Glenn
FRC #0359 (Hawaiian Kids)
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Re: pic: Tiki Techs 2-Speed VexPro Driven WCD

Quote:
Originally Posted by R.C. View Post
Mr. H,

Awesome! Everyone has to start somewhere. That is true, the larger the sprocket the less working load on the chain. For reference, many teams that do WCD use a 16T-18T sprocket in the 3" to 6" wheel size. Looking at the sprockets available. It would be cheaper and light to use the 32T..

Three speed might be a bit much for your first time around, but either DOG or BALL shifting works well. There is a table on the DOG shifter page that shows output speeds based on wheel size.

With a larger wheel your going to need *MORE* reduction. You want to be somwewhere *4-9* FPS in low gear and *12-18* in high gear.

Hope some of this helps!
Charts like these are about the only thing I look at when deciding what ratios we use. Someone else did the math.....we trust the info shown.
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