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London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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@Alexnharvey
http://www.machinehead-software.co.uk/bike/chain_length/sprocket_radius_table.html
Cog Teeth Radius (Inches) Difference (Inches)
10 0.8090
11 0.8874 0.0784
12 0.9659 0.0786
13 1.0447 0.0787
14 1.1235 0.0788
15 1.2025 0.0789
16 1.2815 0.0790
17 1.3606 0.0791
18 1.4397 0.0791
19 1.5189 0.0792
20 1.5981 0.0792
21 1.6774 0.0793
22 1.7567 0.0793
23 1.8360 0.0793
24 1.9154 0.0793
25 1.9947 0.0794
26 2.0741 0.0794
27 2.1535 0.0794
28 2.2329 0.0794
29 2.3123 0.0794
30 2.3918 0.0794
31 2.4712 0.0794
32 2.5506 0.0794
33 2.6301 0.0795
34 2.7096 0.0795
35 2.7890 0.0795
36 2.8685 0.0795
37 2.9480 0.0795
38 3.0275 0.0795
39 3.1070 0.0795
40 3.1865 0.0795
41 3.2660 0.0795
42 3.3455 0.0795
43 3.4250 0.0795
44 3.5045 0.0795
45 3.5840 0.0795
46 3.6635 0.0795
47 3.7430 0.0795
48 3.8225 0.0795
49 3.9021 0.0795
50 3.9816 0.0795
51 4.0611 0.0795
52 4.1407 0.0795
53 4.2202 0.0795
54 4.2997 0.0795
55 4.3793 0.0795