
Originally Posted by
OakLeaf
This has been discussed to death....
It's less about the total range of gears you need, than it is about the range of RPMs you're comfortable pedaling.
With a mountain cassette and RD, you can have very low gearing with a compact. You'll always be able to get somewhat lower with a triple, but usually only by one or two gears. But a triple will let you get closer ratios for any given range of gearing.
Are there "holes" in your current gearing now, where one gear feels too short and the next one feels too tall? Do you need your cassette to be close-ratio for your knees or your muscles to be happy? Do you need to keep your cadence within about a 5-8 RPM range? And in addition to those, do you have many hills over 10-12% in your area? Then get a triple.
If you can tolerate fairly large jumps in gearing, OR you live in terrain without steep climbs (note that many very mountainous areas have built their roads with gentle grades so the trucks can get up them, whereas areas with small hills can be quite steep) - then a compact will make shifting less complicated and possibly a little smoother.
Great post, Oakleaf.
I think it might help to clarify, too, that there are "standard" doubles, e.g., a 53-39, and "compact" doubles. While I might the OP is talking about a compact double, it's not clear from her post.
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