Shimano Gear Ratio Calculator

Calculate gear ratios for Shimano groupsets. Preloaded with common Shimano chainrings and cassettes — from 105 and Ultegra to GRX and Deore XT — so you can compare gearing in seconds.

This calculator is preset with typical Shimano specifications. Adjust the parameters to match your specific Shimano setup and explore different gear combinations.

mm
Chainring
36
Chainring
52
Cog
11
Cog
12
Cog
13
Cog
14
Cog
15
Cog
17
Cog
19
Cog
21
Cog
23
Cog
25
Cog
27

Bicycle Gear Ratio Chart

You can hover each gear combination to see the development, speed, and chain angle.

36T
  • 27T
    1.332.81 m · 15.2 km/h
  • 25T
    1.443.03 m · 16.4 km/h
  • 23T
    1.573.29 m · 17.8 km/h
  • 21T
    1.713.61 m · 19.5 km/h
  • 19T
    1.893.99 m · 21.5 km/h
  • 17T
    2.124.46 m · 24.1 km/h
  • 15T
    2.405.05 m · 27.3 km/h
  • 14T
    2.575.41 m · 29.2 km/h
  • 13T
    2.775.83 m · 31.5 km/h
  • 12T
    3.006.32 m · 34.1 km/h
  • 11T
    3.276.89 m · 37.2 km/h
52T
  • 27T
    1.934.05 m · 21.9 km/h
  • 25T
    2.084.38 m · 23.6 km/h
  • 23T
    2.264.76 m · 25.7 km/h
  • 21T
    2.485.21 m · 28.1 km/h
  • 19T
    2.745.76 m · 31.1 km/h
  • 17T
    3.066.44 m · 34.8 km/h
  • 15T
    3.477.30 m · 39.4 km/h
  • 14T
    3.717.82 m · 42.2 km/h
  • 13T
    4.008.42 m · 45.5 km/h
  • 12T
    4.339.12 m · 49.3 km/h
  • 11T
    4.739.95 m · 53.7 km/h

Development · Speed — Faded bars exceed your max chain angle (cross-chaining).

Bicycle Gear Ratio Table

Cog27
Cog25
Cog23
Cog21
Cog19
Cog17
Cog15
Cog14
Cog13
Cog12
Cog11
Chainring36
1.33
15.2 km/h
2.81 m
1.44
16.4 km/h
3.03 m
1.57
17.8 km/h
3.29 m
1.71
19.5 km/h
3.61 m
1.89
21.5 km/h
3.99 m
2.12
24.1 km/h
4.46 m
2.40
27.3 km/h
5.05 m
2.57
29.2 km/h
5.41 m
2.77
31.5 km/h
5.83 m
3.00
34.1 km/h
6.32 m
3.27
37.2 km/h
6.89 m
Chainring52
1.93
21.9 km/h
4.05 m
2.08
23.6 km/h
4.38 m
2.26
25.7 km/h
4.76 m
2.48
28.1 km/h
5.21 m
2.74
31.1 km/h
5.76 m
3.06
34.8 km/h
6.44 m
3.47
39.4 km/h
7.30 m
3.71
42.2 km/h
7.82 m
4.00
45.5 km/h
8.42 m
4.33
49.3 km/h
9.12 m
4.73
53.7 km/h
9.95 m

Scroll sideways to see more gear combinations.

2.50 ⚠Greyed-out, struck-through combinations exceed your max chain angle (cross-chaining) and are best avoided.

Total Gear Range: 354.6%

Need to calculate the correct Chain length for this gear ratio?

Selected Cassette: 11-27

Selected Chainrings: 36/52

Calculate Chain Length for This Configuration

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About the Shimano Gear Ratio Calculator

Learn more about the calculator and its creator

Jonas

Jonas

I'm a software developer and bike enthusiast from Germany with over 10 years of cycling experience. I built this Shimano gear ratio calculator to help riders dial in their gearing.

Understanding Shimano Gear Ratios

This calculator is preloaded with typical Shimano gearing so you can compare gear ratios, gear inches, development and chain angle across Shimano's road, gravel and mountain bike groupsets. Pick a preset that matches your bike, or fine-tune the chainrings and cassette to your exact Shimano setup.

How a Shimano gear ratio is calculated

A gear ratio is simply the number of teeth on the front chainring divided by the number of teeth on the rear sprocket. Shimano groupsets don't change this maths — they just define which chainring and cassette combinations are available.

Gear ratio = chainring teeth / sprocket teeth Example (Shimano 105, 50/34 with 11-32): 50 / 11 = 4.55 (hardest gear) 34 / 32 = 1.06 (easiest gear)

Shimano road groupsets

Shimano's road hierarchy runs Claris, Sora, Tiagra, 105, Ultegra and Dura-Ace. The higher tiers are lighter and shift better, but groupsets at the same level share gearing options. Current 105 (R7100), Ultegra (R8100) and Dura-Ace (R9200) are 12-speed and commonly use a 50/34 compact or 52/36 semi-compact chainset with an 11-30, 11-34 or 11-36 cassette.

Groupset Typical chainrings Typical cassette Best for
105 / Ultegra / Dura-Ace 50/34 11-34 All-round, climbing
Ultegra / Dura-Ace 52/36 11-30 Fast, balanced
Dura-Ace 54/40 11-28 Racing, flat
GRX (gravel) 48/31 or 40 (1×) 11-34 / 10-45 Gravel, mixed terrain

Shimano gravel and mountain groupsets

GRX is Shimano's gravel range and offers both 1× and 2× setups with wider cassettes than road. On the dirt side, Shimano's mountain hierarchy runs Deore, SLX, XT and XTR, mostly 1×12 with Micro Spline cassettes up to 10-51. A 32-tooth chainring with a 10-51 cassette spans from a very low 0.63 climbing gear to a 3.2 top gear — huge range for technical trails.

Compatibility notes

Shimano 11-speed and 12-speed road parts are not interchangeable, and 12-speed mountain cassettes use the Micro Spline freehub rather than the older HG standard. Because "speed count" alone tells you nothing about how a bike actually feels, use the table above and the calculator to compare real gear ratios, gear inches and development between setups before you buy.

Want to compare against a different brand? Try the SRAM gear ratio calculator or the full bicycle gear ratio calculator for any custom chainring and cassette combination.

Frequently Asked Questions

What gear ratios does Shimano 105 use?

Shimano 105 (R7000/R7100) typically pairs a 50/34 compact or 52/36 semi-compact chainset with an 11-30, 11-32 or 11-34 cassette. A 50/34 with 11-32 gives a low gear around 1.06 and a high gear around 4.55, which suits most climbing and flat-road riding.

Is Shimano 11-speed compatible with 12-speed?

No. Shimano 11-speed and 12-speed road systems use different cassette spacing and freehub or shifter standards, so they are not cross-compatible. Use this calculator to compare the actual gear ratios rather than relying on speed count alone.

What is the easiest Shimano gear for climbing?

For steep climbs, a 34-tooth chainring with a large cassette cog (32, 34 or more on GRX/XT) gives the lowest gear. A 34x34 combination produces a ratio of 1.0, meaning one crank turn equals one wheel turn — ideal for spinning up gradients.

What is the difference between Shimano Ultegra and Dura-Ace gearing?

Ultegra and Dura-Ace offer the same chainring and cassette options (e.g. 50/34 or 52/36 with 11-30); Dura-Ace is lighter and higher-end but the gear ratios are identical. This calculator shows the gearing both groupsets share.

Related Calculators

Other helpful calculators for Cycling

Bike Gear Ratio Calculator

Calculate gear ratio, gear inches and chain angle of your bike based on the chainring and sprocket sizes.

SRAM Gear Ratio Calculator

Calculate gear ratios for SRAM groupsets. Preloaded with SRAM chainrings and XDR/Eagle cassettes — from Rival and Force to RED and Eagle — so you can compare 1x and 2x gearing instantly.

Bicycle Chain Length Calculator

Calculate the correct bike chain length in links or inches using the standard formula. Enter your chainstay length, chainring, and cassette size for precise results.