On 05/29/2016 05:15 AM, Tim Butterfield wrote:
Building further on the 2x10 possibility, I did some further playing
with Sheldon's gear inch calculator. If I could pair the Sugino XD2
26t-40t crank with the Praxis 11-40 10 speed cassette, that would
provide a range of 26x40=17.6 up to 40x11=98.2. From 17.6 to 98.2 is
quite a range of gear inches. I not sure if I would use either
extreme, but they might come in handy if I ever needed it, especially
if I put a decent sized bag on the back rack. For a weak rider that
might have a mix of flats and hills, what would you think of that range?
It's not just the range. Here's your proposed gearing (if not the
exact cassette, close to it):
63.8 98.2
54.0 83.1
46.8 72.0
41.3 63.5
36.9 56.8
33.4 51.4
29.2 45.0
25.1 38.6
21.9 33.8
19.5 30.0
17.6 27.0
A good general rule is you want your main cruising gear, the one you use
for level ground w/o winds helping or hindering, to be in the middle of
the cassette. Here you are on the 3rd position. Going up has one
moderate step and one pretty large one. Going down, you have plenty -
enough so that for anything but seriously hilly country you need never
go to the small ring. But when you do, look at what happens: you drop
so much you'll feel as though you dropped the chain, and will have to
immediately upshift two to four times to get to the "next lower" gear,
depending on where you are on the cassette. That can be hard to live
with. Also, 17.6 is exceptionally low. Most people only have a use for
a gear that low in the most severe terrain when they are carrying loaded
panniers front and rear.
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