Well, i find on flats, my little ring is a bit to small, and the big ring a tad to big, and i hate going between them, i'd much rather flick between gears in the rear. Additionaly i have a tuff time on some of the tuff hills, i wanted some ever so slightly easier climbing gears.
My purposed switch is to replace my 12-25, with a 11-28, and my big 53, with a 49.
I worked out the numbers as follows below;
I can still keep the same speeds on the big ring for sprinting and such, but the little ring now has the range of speed i would preffer for average long rolly rides (40-27km/h), and 2 better climbing gears for the steap ones around here.
It's less expensive then converting my double to a triple, but i'm open to other ideas.
Feedback appreciated.
Code:
KM/H @ 100 rpm cadence.
Current setup.
53 35.9 % 39
12 55.6 40.9
8.3 %
13 51.3 37.7
7.7 %
14 47.6 35.0
7.1 %
15 44.5 32.7
13.3 %
17 39.2 28.9
11.8 %
19 35.1 25.8
10.5 %
21 31.8 23.4
9.5 %
23 29.0 21.3
8.7 %
25 26.7 19.6
New casset and smaller big ring
49 25.6 % 39
11 56.0 44.6
9.1 %
12 51.4 40.9
8.3 %
13 47.4 37.7
7.7 %
14 44.0 35.0
14.3 %
16 38.5 30.7
12.5 %
18 34.3 27.3
16.7 %
21 29.4 23.4
14.3 %
24 25.7 20.4
16.7 %
28 22.0 17.5
kinda makes me wish there was a 15 speed
