Holdsworth Gear Chart for 27 Inch Wheels (Undated) — Chainring Sizes 36 to 57 Against Sprocket Sizes

An undated gear chart for 27 inch wheels: chainrings of 36 to 57 teeth across, sprockets down, with the gear in inches in each cell.

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GEAR CHART 27″ WHEELS
CHAINRING SIZE
SPROCKET SIZE
36 38 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57
12 81.0 85.5 90.0 92.2 94.5 96.7 99.0 101.2 103.5 105.8 108.0 110.2 112.5 114.7 117.0 119.2 121.5 123.7 126.0 128.1
13 74.8 78.9 83.1 85.1 87.2 89.3 91.4 93.4 95.5 97.6 99.7 101.8 103.9 105.9 108.0 110.0 112.1 114.2 116.3 118.3
14 69.5 73.3 77.1 79.1 81.0 82.9 84.9 86.8 88.7 90.6 92.6 94.5 96.4 98.3 100.3 102.2 104.1 106.0 108.0 109.9
15 64.8 68.4 72.0 73.8 75.6 77.4 79.2 81.0 82.8 84.6 86.4 88.2 90.0 91.8 93.6 95.4 97.2 99.0 100.8 102.6
16 60.8 64.2 67.5 69.1 70.9 72.5 74.3 75.9 77.6 79.3 81.0 82.7 84.4 86.0 87.8 89.4 91.1 92.8 94.5 96.1
17 57.2 60.4 63.6 65.1 66.7 68.3 69.9 71.5 73.1 74.6 76.2 77.8 79.4 81.0 82.6 84.2 85.7 87.3 88.9 90.5
18 54.0 57.0 60.0 61.5 63.0 64.5 66.0 67.5 69.0 70.5 72.0 73.5 75.0 76.5 78.0 79.5 81.0 82.5 84.0 85.5
19 51.2 54.0 56.8 58.3 59.7 61.1 62.5 64.0 65.4 66.8 68.2 69.6 71.1 72.4 73.9 75.3 76.7 78.2 79.5 81.0
20 48.6 51.3 54.0 55.3 56.7 58.0 59.4 60.7 62.1 63.4 64.8 66.2 67.5 68.8 70.2 71.5 72.9 74.2 75.6 76.9
21 46.3 48.9 51.4 52.7 54.0 55.3 56.6 57.8 59.2 60.4 61.7 63.0 64.3 65.5 66.9 68.2 69.4 70.7 72.0 73.3
22 44.2 46.6 49.1 50.3 51.5 52.7 54.0 55.2 56.5 57.6 58.9 60.1 61.4 62.6 63.8 65.0 66.2 67.5 68.7 69.9
23 42.3 44.6 47.0 48.1 49.3 50.4 51.6 52.8 54.0 55.2 56.3 57.5 58.7 59.8 61.0 62.2 63.4 64.5 65.7 66.9
24 40.5 42.7 45.0 46.1 47.3 48.3 49.5 50.6 51.8 52.9 54.0 55.1 56.3 57.3 58.5 59.6 60.7 61.8 63.0 64.1
25 38.9 41.1 43.2 44.3 45.4 46.4 47.5 48.6 49.7 50.8 51.8 52.9 54.0 55.1 56.2 57.2 58.3 59.4 60.4 61.6
26 37.4 39.5 41.5 42.6 43.6 44.6 45.7 46.7 47.8 48.8 49.9 50.9 51.9 53.0 54.0 55.0 56.1 57.2 58.1 59.2
27 36.0 38.0 40.0 41.0 42.0 43.0 44.0 45.0 46.0 47.0 48.0 49.0 50.0 51.0 52.0 53.0 54.0 55.0 56.0 57.0
28 34.8 36.6 38.6 39.5 40.5 41.4 42.4 43.4 44.4 45.3 46.3 47.2 48.2 49.2 50.1 51.1 52.0 53.0 54.0 55.0
29 33.5 35.4 37.2 38.1 39.1 40.0 41.0 41.9 42.8 43.7 44.7 45.6 46.5 47.5 48.4 49.4 50.3 51.2 52.1 53.1
30 32.4 34.2 36.0 36.9 37.8 38.7 39.6 40.5 41.4 42.2 43.2 44.1 45.0 45.9 46.8 47.7 48.6 49.5 50.4 51.3
31 31.3 33.1 34.8 35.7 36.6 37.4 38.4 39.2 40.1 40.9 41.8 42.7 43.6 44.4 45.3 46.2 47.0 47.9 48.8 49.7
[A ruled table of gear numbers with the chainring sizes across the top and the sprocket sizes down the left side, set in a rounded dark border; alternate columns are shaded gray.]