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Bike Gear Calculator

Calculate bicycle gear ratios and gear inches for optimal cycling performance

Calculate Bike Gear Ratios

Chainring (Front Gears)

teeth
teeth

Cog (Rear Gears)

teeth
teeth

Wheel Diameter

mm

Gear Analysis Results

342
Total Combinations
1.14 - 4.55
Gear Ratio Range
31.5"
Min Gear Inches
125.3"
Max Gear Inches
Chainring11T12T13T14T15T16T17T18T19T20T21T22T23T24T25T26T27T28T
32T
2.91
80.2"
2.67
73.5"
2.46
67.8"
2.29
63"
2.13
58.8"
2
55.1"
1.88
51.9"
1.78
49"
1.68
46.4"
1.6
44.1"
1.52
42"
1.45
40.1"
1.39
38.3"
1.33
36.7"
1.28
35.3"
1.23
33.9"
1.19
32.7"
1.14
31.5"
33T
3
82.7"
2.75
75.8"
2.54
70"
2.36
65"
2.2
60.6"
2.06
56.8"
1.94
53.5"
1.83
50.5"
1.74
47.9"
1.65
45.5"
1.57
43.3"
1.5
41.3"
1.43
39.5"
1.38
37.9"
1.32
36.4"
1.27
35"
1.22
33.7"
1.18
32.5"
34T
3.09
85.2"
2.83
78.1"
2.62
72.1"
2.43
66.9"
2.27
62.5"
2.13
58.6"
2
55.1"
1.89
52.1"
1.79
49.3"
1.7
46.9"
1.62
44.6"
1.55
42.6"
1.48
40.7"
1.42
39"
1.36
37.5"
1.31
36"
1.26
34.7"
1.21
33.5"
35T
3.18
87.7"
2.92
80.4"
2.69
74.2"
2.5
68.9"
2.33
64.3"
2.19
60.3"
2.06
56.7"
1.94
53.6"
1.84
50.8"
1.75
48.2"
1.67
45.9"
1.59
43.8"
1.52
41.9"
1.46
40.2"
1.4
38.6"
1.35
37.1"
1.3
35.7"
1.25
34.4"
36T
3.27
90.2"
3
82.7"
2.77
76.3"
2.57
70.9"
2.4
66.1"
2.25
62"
2.12
58.4"
2
55.1"
1.89
52.2"
1.8
49.6"
1.71
47.2"
1.64
45.1"
1.57
43.1"
1.5
41.3"
1.44
39.7"
1.38
38.2"
1.33
36.7"
1.29
35.4"
37T
3.36
92.7"
3.08
85"
2.85
78.4"
2.64
72.8"
2.47
68"
2.31
63.7"
2.18
60"
2.06
56.6"
1.95
53.7"
1.85
51"
1.76
48.6"
1.68
46.3"
1.61
44.3"
1.54
42.5"
1.48
40.8"
1.42
39.2"
1.37
37.8"
1.32
36.4"
38T
3.45
95.2"
3.17
87.3"
2.92
80.6"
2.71
74.8"
2.53
69.8"
2.38
65.5"
2.24
61.6"
2.11
58.2"
2
55.1"
1.9
52.4"
1.81
49.9"
1.73
47.6"
1.65
45.5"
1.58
43.6"
1.52
41.9"
1.46
40.3"
1.41
38.8"
1.36
37.4"
39T
3.55
97.7"
3.25
89.6"
3
82.7"
2.79
76.8"
2.6
71.7"
2.44
67.2"
2.29
63.2"
2.17
59.7"
2.05
56.6"
1.95
53.7"
1.86
51.2"
1.77
48.9"
1.7
46.7"
1.63
44.8"
1.56
43"
1.5
41.3"
1.44
39.8"
1.39
38.4"
40T
3.64
100.2"
3.33
91.9"
3.08
84.8"
2.86
78.7"
2.67
73.5"
2.5
68.9"
2.35
64.8"
2.22
61.2"
2.11
58"
2
55.1"
1.9
52.5"
1.82
50.1"
1.74
47.9"
1.67
45.9"
1.6
44.1"
1.54
42.4"
1.48
40.8"
1.43
39.4"
41T
3.73
102.7"
3.42
94.2"
3.15
86.9"
2.93
80.7"
2.73
75.3"
2.56
70.6"
2.41
66.5"
2.28
62.8"
2.16
59.5"
2.05
56.5"
1.95
53.8"
1.86
51.4"
1.78
49.1"
1.71
47.1"
1.64
45.2"
1.58
43.5"
1.52
41.8"
1.46
40.4"
42T
3.82
105.2"
3.5
96.5"
3.23
89"
3
82.7"
2.8
77.2"
2.63
72.3"
2.47
68.1"
2.33
64.3"
2.21
60.9"
2.1
57.9"
2
55.1"
1.91
52.6"
1.83
50.3"
1.75
48.2"
1.68
46.3"
1.62
44.5"
1.56
42.9"
1.5
41.3"
43T
3.91
107.7"
3.58
98.8"
3.31
91.2"
3.07
84.6"
2.87
79"
2.69
74.1"
2.53
69.7"
2.39
65.8"
2.26
62.4"
2.15
59.3"
2.05
56.4"
1.95
53.9"
1.87
51.5"
1.79
49.4"
1.72
47.4"
1.65
45.6"
1.59
43.9"
1.54
42.3"
44T
4
110.2"
3.67
101"
3.38
93.3"
3.14
86.6"
2.93
80.8"
2.75
75.8"
2.59
71.3"
2.44
67.4"
2.32
63.8"
2.2
60.6"
2.1
57.7"
2
55.1"
1.91
52.7"
1.83
50.5"
1.76
48.5"
1.69
46.6"
1.63
44.9"
1.57
43.3"
45T
4.09
112.7"
3.75
103.3"
3.46
95.4"
3.21
88.6"
3
82.7"
2.81
77.5"
2.65
73"
2.5
68.9"
2.37
65.3"
2.25
62"
2.14
59.1"
2.05
56.4"
1.96
53.9"
1.88
51.7"
1.8
49.6"
1.73
47.7"
1.67
45.9"
1.61
44.3"
46T
4.18
115.2"
3.83
105.6"
3.54
97.5"
3.29
90.6"
3.07
84.5"
2.88
79.2"
2.71
74.6"
2.56
70.4"
2.42
66.7"
2.3
63.4"
2.19
60.4"
2.09
57.6"
2
55.1"
1.92
52.8"
1.84
50.7"
1.77
48.8"
1.7
47"
1.64
45.3"
47T
4.27
117.8"
3.92
107.9"
3.62
99.6"
3.36
92.5"
3.13
86.4"
2.94
81"
2.76
76.2"
2.61
72"
2.47
68.2"
2.35
64.8"
2.24
61.7"
2.14
58.9"
2.04
56.3"
1.96
54"
1.88
51.8"
1.81
49.8"
1.74
48"
1.68
46.3"
48T
4.36
120.3"
4
110.2"
3.69
101.8"
3.43
94.5"
3.2
88.2"
3
82.7"
2.82
77.8"
2.67
73.5"
2.53
69.6"
2.4
66.1"
2.29
63"
2.18
60.1"
2.09
57.5"
2
55.1"
1.92
52.9"
1.85
50.9"
1.78
49"
1.71
47.2"
49T
4.45
122.8"
4.08
112.5"
3.77
103.9"
3.5
96.5"
3.27
90"
3.06
84.4"
2.88
79.4"
2.72
75"
2.58
71.1"
2.45
67.5"
2.33
64.3"
2.23
61.4"
2.13
58.7"
2.04
56.3"
1.96
54"
1.88
51.9"
1.81
50"
1.75
48.2"
50T
4.55
125.3"
4.17
114.8"
3.85
106"
3.57
98.4"
3.33
91.9"
3.13
86.1"
2.94
81.1"
2.78
76.6"
2.63
72.5"
2.5
68.9"
2.38
65.6"
2.27
62.6"
2.17
59.9"
2.08
57.4"
2
55.1"
1.92
53"
1.85
51"
1.79
49.2"

Top values: Gear ratios | Bottom values: Gear inches (when enabled)

Higher gear ratios = harder to pedal, higher speed potential

Lower gear ratios = easier to pedal, better for climbing

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Understanding Bike Gears

Gear Ratio

The gear ratio is calculated by dividing the number of teeth on the chainring by the number of teeth on the rear cog.

Gear Ratio = Chainring Teeth ÷ Cog Teeth

Gear Inches

Gear inches represent the equivalent wheel diameter of a direct-drive bicycle that would have the same gear ratio.

Gear Inches = Gear Ratio × Wheel Diameter (inches)

Gear Selection Guide

Low Gears (Easy)

Ratio: 1.0 - 2.0 | Best for steep climbs and starting from a stop

Medium Gears

Ratio: 2.0 - 3.5 | Ideal for normal riding and moderate hills

High Gears (Hard)

Ratio: 3.5+ | Perfect for flat terrain and high speeds

Cycling Performance Tips

🚴

Optimal Cadence: Maintain 80-100 RPM for efficiency

⛰️

Climbing: Shift to easier gears before the hill

💨

Speed: Use harder gears for flat terrain and descents

🔧

Maintenance: Keep drivetrain clean for smooth shifting

Related Calculators

Bike Cadence & Speed Calculator

Calculate cycling speed from cadence and gear ratio

Calories Burned Biking

Calculate calories burned during cycling

Bike Size Calculator

Find the right bike frame size

Complete Guide to Bike Gear Calculations

What is a Gear Ratio?

A gear ratio is a fundamental measure of bicycle gearing that indicates how many times the rear wheel turns for each complete pedal revolution. It's calculated by dividing the number of teeth on the front chainring by the number of teeth on the rear cog.

Example Calculation:

Chainring: 50 teeth
Rear Cog: 25 teeth
Gear Ratio: 50 ÷ 25 = 2.0

This means for every complete pedal revolution, the rear wheel turns 2 times. Higher ratios require more force but provide higher speeds, while lower ratios are easier to pedal but result in lower speeds.

Understanding Gear Inches

Gear inches is a traditional measurement that corresponds to the diameter of the drive wheel of a penny-farthing bicycle with equivalent gearing. It provides an intuitive way to compare different gear combinations across different wheel sizes.

Calculation Formula:

Gear Inches = Gear Ratio × Wheel Diameter (inches)
Example: 2.0 × 27.5" = 55 gear inches

Typical gear inch ranges: Low gears (20-40"), moderate gears (40-70"), high gears (70-120"+)

How to Use This Calculator Effectively

1. Input Your Setup

  • • Enter your chainring range (front gears)
  • • Input your cassette range (rear gears)
  • • Select your wheel size or enter custom diameter
  • • Choose whether to display gear inches

2. Analyze Results

  • • Review the gear ratio table
  • • Identify your easiest and hardest gears
  • • Look for gear overlap or gaps
  • • Note the total number of combinations

3. Optimize Your Setup

  • • Ensure adequate range for your riding style
  • • Consider component compatibility
  • • Plan for future upgrades
  • • Test different combinations

Gear Selection for Different Riding Styles

🏔️ Mountain Biking

Recommended Range: 1.0 - 4.0 gear ratio | Prioritize low gears for steep climbs. Consider 1x (single chainring) setups for simplicity.

🚴 Road Cycling

Recommended Range: 1.5 - 5.0 gear ratio | Balance climbing ability with high-speed potential. Traditional 2x setups remain popular.

🏙️ Commuting

Recommended Range: 1.5 - 3.5 gear ratio | Focus on practical gear range for urban terrain. Consider internal gear hubs for low maintenance.

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