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Gear Chart (in Inches)
for 700C Wheels and Typical Chainwheel Sizes |
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27 |
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Wheel Size: |
27.0000 |
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Effective Wheelsize: |
27.0000 |
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39 |
42 |
44 |
45 |
46 |
47 |
48 |
49 |
50 |
51 |
52 |
53 |
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12 |
87.8 |
94.5 |
99.0 |
101.3 |
103.5 |
105.8 |
108.0 |
110.3 |
112.5 |
114.8 |
117.0 |
119.3 |
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13 |
81.0 |
87.2 |
91.4 |
93.5 |
95.5 |
97.6 |
99.7 |
101.8 |
103.8 |
105.9 |
108.0 |
110.1 |
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14 |
75.2 |
81.0 |
84.9 |
86.8 |
88.7 |
90.6 |
92.6 |
94.5 |
96.4 |
98.4 |
100.3 |
102.2 |
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15 |
70.2 |
75.6 |
79.2 |
81.0 |
82.8 |
84.6 |
86.4 |
88.2 |
90.0 |
91.8 |
93.6 |
95.4 |
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16 |
65.8 |
70.9 |
74.3 |
75.9 |
77.6 |
79.3 |
81.0 |
82.7 |
84.4 |
86.1 |
87.8 |
89.4 |
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17 |
61.9 |
66.7 |
69.9 |
71.5 |
73.1 |
74.6 |
76.2 |
77.8 |
79.4 |
81.0 |
82.6 |
84.2 |
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18 |
58.5 |
63.0 |
66.0 |
67.5 |
69.0 |
70.5 |
72.0 |
73.5 |
75.0 |
76.5 |
78.0 |
79.5 |
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19 |
55.4 |
59.7 |
62.5 |
63.9 |
65.4 |
66.8 |
68.2 |
69.6 |
71.1 |
72.5 |
73.9 |
75.3 |
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20 |
52.7 |
56.7 |
59.4 |
60.8 |
62.1 |
63.5 |
64.8 |
66.2 |
67.5 |
68.9 |
70.2 |
71.6 |
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Recommended gears for racing: low
90's for mass start events, mid to high 90's for TT events |
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1J6.
Junior Gears. The maximum chaingear ratio for Junior riders is based on age
and discipline. |
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Track |
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17-18: Unrestricted |
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Multiply gear inches in above chart
times Pi (3.1416) to get the rollout distance. |
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15-16: 6.78 meters
(22'3")(48x15) |
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13-14: 6.36 meters
(20'10.5")(48x16) |
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10-12: 6.00 meters (19’8”)(48x17) |
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