For me, it's a case of necessity - not so much perfectionism.  I ride the 
Texas hill country on a '76 Nottingham Raleigh.  Not comparing myself, but 
this is where Lance developed his cooling system.  My old bike has 122mm 
dropout spacing, and the only way to get more than 5 gears in there would 
be a major wheel revision.  With 42/52 chainrings, and 13 to 28  in the 
rear, and I discovered I only had 5 effective gears, and nothing between 70 
and 88 gear-inches.  I replaced my front chainrings with 41/46 (144bcd - I 
know, I could have replaced the crank, but I like it).  I ended up with 9 
effective gears, all evenly spaced, and 3 of them between 70 and 88.  

On Saturday, December 29, 2012 1:38:22 PM UTC-6, Tom Harrop wrote:
>
> You're right, I would be perfectly content with the 13–34. I'm no 
> gear-ratio perfectionist, and I don't even know what the steps on my 
> current cassette are, but it seems easy enough to slip the extra sprocket 
> on the freehub so I may as well try it. Because I'm a lazy shifter, and I 
> don't often shift at the front, I tend to use the three chainrings as 
> 'sets' of ratios—stay in the big ring for cruising, middle if I'm off 
> pavement, carrying stuff or it's windy etc., small for really steep 
> hills—so I don't really mind having gears that are duplicated between the 
> 'sets'. I would never make a front shift just to fill a gap between 
> cassette sprockets! Far too lazy...
>
> Thanks again for the input.
>
> Tom
>

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