looks like a great solution, Tom.  
here's my gear-inch chart on my 5-gear rear sprocket and two close 
chainrings.  
the 20-16 is a cliff.  

4112.2 %462839.544.416.7 %2446.151.820.0 %2055.462.125.0 %1669.277.623.1 %13
85.295.5

but resulting 40 to 96 gear-inches, and very even spread - everything is 
useful with no overlaps.  
and here are my good-looking close-ratio chainrings. 

<http://img.photobucket.com/albums/v728/bulldog1935/Raleigh/aPC310011_zpse51abc77.jpg>


On Sunday, January 13, 2013 5:19:47 AM UTC-6, Tom Harrop wrote:
>
> Just thought I'd update this thread in case someone else googles it up. I 
> made the switch to a 7-speed 13–28 HG cassette plus a 36t sprocket and a 
> SRAM 8-speed chain. To put it scientifically, I would say the drivetrain 
> feels a bazillion times better. No more ghost shifting or chain skipping 
> under load. The shift from the 28 to the 36 is just fine by my standards.
>
> I'm afraid it wasn't a very scientific experiment—aside from the new chain 
> and cassette I also switched the bottom bracket cable guide, which didn't 
> look like it was guiding the cables very smoothly (unless two 20° bends are 
> a good thing), so that could have been partly responsible for the ghost 
> shifting. Anyway, I'm happy and I won't be going back to 9 speed anytime 
> soon. The 'frankencassette' looks bizarre with 7 black sprockets and the 
> silver 36t, but I can't see it when I'm riding, as they say.
>
> Thanks again for the input!
>

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