Quote Originally Posted by Triskeliongirl View Post
What do you guys think of running an SRAM 11-28 casette on a durace 10 drivetrain? I like the slightly better gear ratios of the 11/28 (w 650c wheels 12/27= 30.6-101.3; 11/28=29.5-110.5) vs the durace 12-27, but will the shifting be crisper if I stick with all durace?
The SRAM cassette should work fine. Because the DA cassette is only 12-27, though, you're going to have smaller gaps when you shift. To me, that's a good thing. [Technically, Shimano's road RDs have a capacity of 27 teeth, but it's well known you can push them another tooth to 28.]

What sort of crankset are you going to run up front? Sometimes 650c-equipped bikes come with bigger chainrings to make the gear ratios like on a standard crankset equipped bike with 700c wheels.

If you're running a standard crankset (which would approximate a compact on a 700c bike; it's what I'd want on a 650c bike), the cassette with the tighter cluster might be preferable. If you live in a pretty hilly area, you might appreciate the 28.