Standard Sprocket size for a 17" rear wheel

[Ashwin]

Hi all,

I'm looking for what is the standard sprocket size for a 17" rear wheel. I saw two wheels earlier and they had the same sized sprockets (different manufacturers) and just wanted to know the diameter of the sprocket that you would use on a 17" (420mm) rear wheel

 

[Smokin Joe]

The size of sprocket is to is determined by what gear ratio you require, it's nothing to do with wheel size.

 

[festival]

How do you determine the wheel size to be 17"? There is no such size.
What kid of bike etc are we talking about?