Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
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Within the limitations of your derailleur - 11-27t max and 29t of chain takeup capacity (the sum of the differences between the largest and smallest chainrings, and the largest and smallest rear sprockets, ie. 39/53 & 11/25 = 14t + 14t or 27t total) - the cassette choice is entirely yours and should be made based on what's right for you and the terrain you're riding in.
If it's hilly and you're not that strong, you'd lean toward a wider cassette, if flat and you don't need low gearing for hills a narrower cassette gives you closer spaced gears.
An ounce of diagnosis is worth a pound of cure.
“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin
“One accurate measurement is worth a thousand expert opinions”
- Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance
Last edited by FBinNY; 08-29-12 at 06:16 AM.