Mike's Bicycle Gear Calculator - Title
Cassette











Required Rear Derailleur Capacity:

Chainrings Wheel Crank



Required Front Derailleur Capacity:


(10)
(9)
(8)
(7)
(6)
(5)
(4)
(3)
(2)
(1)
Gear Inch Chart - 10 x 3
12
13
14
15
16
17
19
21
23
25
46
102.0
94.2
87.4
81.6
76.5
72.0
64.4
58.3
53.2
49.0
36
79.8
73.7
68.4
63.9
59.9
56.4
50.4
45.6
41.7
38.3
24
53.2
49.1
45.6
42.6
39.9
37.6
33.6
30.4
27.8
25.5
Semi-Log Graph
20
30
40
50
60
70
80
90
100
110
120
130

Speed over RPM Range
 
RPM Range from to RPM     mph kph     Grid     Sort
0
5
10
15
20
25
30
35
25
23
21
19
17
16
15
14
13
12
25
23
21
19
17
16
15
14
13
12
25
23
21
19
17
16
15
14
13
12

Sheldon Brown's Gain Ratio Chart

12
13
14
15
16
17
19
21
23
25
46
7.62
7.04
6.53
6.10
5.72
5.38
4.81
4.36
3.98
3.66
36
5.96
5.51
5.11
4.77
4.47
4.21
3.77
3.41
3.11
2.86
24
3.98
3.67
3.41
3.18
2.98
2.81
2.51
2.27
2.07
1.91

Rollout Table     Inches Meters

12
13
14
15
16
17
19
21
23
25
46
8.14
7.52
6.98
6.51
6.11
5.75
5.14
4.65
4.25
3.91
36
6.37
5.88
5.46
5.10
4.78
4.50
4.02
3.64
3.32
3.06
24
4.25
3.92
3.64
3.40
3.19
3.00
2.68
2.43
2.21
2.04

Speed at RPM     mph kph

12
13
14
15
16
17
19
21
23
25
46
27.3
25.2
23.4
21.9
20.5
19.3
17.3
15.6
14.3
13.1
36
21.4
19.7
18.3
17.1
16.0
15.1
13.5
12.2
11.2
10.3
24
14.3
13.2
12.2
11.4
10.7
10.1
9.0
8.1
7.4
6.8

Choose Chart type:     ASCII Graphical

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A New revision at a new location will be released soon. Email me if you want to be notified.

Revision 5.0 is online for my testing HERE. Try it out and let me know what you think.

It is now usable from a smart phone screen.

This is revision 4.4.2
Please send comments, suggestions, and bug reports to:
Mike Sherman at wheelwrightmike@gmail.com
You can look at the Credits, Help, and Revision History for this program.

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