Whats the most common roller chain norm for bicycles?

[wolterh]

I am designing a bike in Autodesk Inventor for a university project, and I am stuck with the sprockets. Inventor can create them fairly easily when you know the norm of the sprocket and the number of teeth it has, but I don't know the standard of the sprocket I have to design; I merely know that its about the same proportion of the rest of the sprockets I have ever seen in bikes, so which is the most common norm?

 

[pantaz]

Are you talking about the chain pitch, or the specific gear ratios? Both are readily available all over the 'net.
http://www.google.com/search?q=bicycle+chain+pitch
http://www.google.com/search?q=bicycle+sprocket+ratio

Short answer, the pitch of bicycle chain has been standardized (for all practical purposes) at one half inch (1/2"), but the width sometimes changes for various applications. Gearing ratios can be just about anything.

 

[wolterh]

Well I was talking about the actual ISO / ANSI norm used in the design process, the pitch diameter I was able to measure and the radius too (I only need one sprocket). Anyway, thanks for your contribution, after tinkering for a while I found a norm that seemed bicycle worthy enough.