Quote:
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!
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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!