pic: Tiki Techs 2-Speed VexPro Driven WCD

[R.C.]

Originally Posted by TikiTech

Aloha,

Thanks for all the comments. I am still a CAD rookie..

We have many sprocket sizes ordered. My understanding is that the larger the sprocket is, the less working load for a given amount of transmitted power, allowing the use of a smaller pitch chain. We are planning to use #25 chain this year since it is readily available locally at the bike shops. I voted for the three speed transmission personally, but was overruled.
There is still time for a change though...I hope...

This is our first attempt at a non KOP drive train.
Any input on gear ratios, wheels, etc., is highly appreciated..

Mahalo!

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!