You can't just "leave off the smallest" sprocket.  You need a first
position sprocket, i.e., a sprocket with a spacer built in; removing it
and leaving the 2nd position sprocket hanging in the wind won't do it.

The way you make a Century Special 13-30 is to start with a 12-27.
Remove the 12 and the 13 tooth sprockets.  Replace the 13 with a first
position 13.  Now add a 30T behind the 27.  Install on a hub.

You can get first position sprockets.  You can order them on Sheldon's
site if your LBS can't or won't do.


On Mon, 2010-02-01 at 14:15 -0700, rswat...@me.com wrote:
> David,
> I did just that recently. Took apart a 9s cassette and made an 8s out  
> of it using spacers from an old 8s casssette. I used the lock ring and  
> outermost 12t cog from the 8s cassette too since the outer cog on the  
> 9 was 11t.
> It works just fine.
> 
> Ryan
> 
> 
> 
> 
> On Feb 1, 2010, at 13:59, cyclotourist <cyclotour...@gmail.com> wrote:
> 
> > A combination of pushing my bike up hill yesterday and the new 12-36  
> > cassette in the latest Reader has me thinking...
> >
> > Can I put "8 speed" spacers between the cogs of a nine speed  
> > cassette and simply leave off the smallest cog? My current 8 speed  
> > cassette is a 12-32 XTR (on a spider), and I'd love to get a 34 or  
> > even 36 low.  I would never need an 11T high, and very rarely use a  
> > 12T.
> >
> > -- 
> > Cheers,
> > David
> > Redlands, CA
> >
> > "Bicycling is a big part of the future. It has to be. There is  
> > something wrong with a society that drives a car to workout in a  
> > gym."  ~Bill Nye, scientist guy
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