On 08/26/2016 04:43 PM, Tim Butterfield wrote:
On Fri, Aug 26, 2016 at 10:32 AM, Steve Palincsar <[email protected]
<mailto:[email protected]>> wrote:
I'm not seeing a 9 speed 12-36 cassette, although I do see a 12-34.
This page has the option for 9 speed 12-36t cassette.
http://www.rivbike.com/product-p/cs.htm
Ah. I see it now.
12 - 14 - 16 - 18 - 21 - 24 - 28 - 32 - 36
gives you this gearing with a "nominal 27 inch wheel"
54.0 81.0 103.5
46.3 69.4 88.7
40.5 60.8 77.6
36.0 54.0 69.0
30.9 46.3 59.1
27.0 40.5 51.8
23.1 34.7 44.4
20.3 30.4 38.8
18.0 27.0 34.5
so that 122 or whatever must be an error of some sort. 103 is far more
reasonable and usable, although to my taste, I'd prefer it a bit lower.
Changing the 1st position sprocket to a 13 would give you this instead:
49.8 74.8 95.5
46.3 69.4 88.7
40.5 60.8 77.6
36.0 54.0 69.0
30.9 46.3 59.1
27.0 40.5 51.8
23.1 34.7 44.4
20.3 30.4 38.8
18.0 27.0 34.5
Here's what my Century Special 13-30 looks like with those same chain rings:
49.8 74.8 95.5
46.3 69.4 88.7
43.2 64.8 82.8
38.1 57.2 73.1
34.1 51.2 65.4
30.9 46.3 59.1
27.0 40.5 51.8
24.0 36.0 46.0
21.6 32.4 41.4
I have this on several bikes, some with 48 instead of 46 T big rings,
some with 26 instead of 24T inner rings. I really like the 95.5" top
gear and the spacing between the top gear and the next one down.
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