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.

This calculator is preset with typical SRAM specifications. Adjust the parameters to match your specific SRAM 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 SRAM 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 SRAM gear ratio calculator to help riders dial in their gearing.

Understanding SRAM Gear Ratios

This calculator is preloaded with typical SRAM gearing so you can compare gear ratios, gear inches, development and chain angle across SRAM's road, gravel and mountain groupsets — including SRAM's popular 1× (single chainring) drivetrains. Pick a preset, or fine-tune the chainring and cassette to match your exact SRAM setup.

How a SRAM gear ratio is calculated

A gear ratio is the number of teeth on the front chainring divided by the number of teeth on the rear sprocket. What makes SRAM distinctive is the 10-tooth smallest cog on its 12-speed cassettes, enabled by the XD/XDR freehub driver — it lets SRAM use a smaller chainring while keeping a high top gear.

Gear ratio = chainring teeth / sprocket teeth Example (SRAM Force, 46/33 with 10-33): 46 / 10 = 4.60 (hardest gear) 33 / 33 = 1.00 (easiest gear)

SRAM road groupsets

SRAM's road hierarchy runs Apex, Rival, Force and RED, with the modern AXS versions being 12-speed and wireless. SRAM road favours smaller chainrings paired with a 10-tooth cassette start, so a 48/35 or 46/33 chainset covers the same range a Shimano 50/34 or 52/36 would.

Groupset Typical chainrings Typical cassette Best for
Rival / Force / RED AXS 48/35 10-33 All-round road
Force / RED AXS 46/33 10-36 Climbing, wide range
RED AXS 50/37 10-28 Racing, flat
XPLR / Eagle (gravel, 1×) 40 or 38 (1×) 10-44 / 10-52 Gravel, adventure

SRAM 1× and Eagle mountain gearing

SRAM popularised the 1× drivetrain — a single front chainring with no front derailleur — for both gravel and mountain biking. SRAM's mountain range (SX, NX, GX, X01, XX1 Eagle) is 12-speed with cassettes up to 10-52. A 32-tooth chainring with a 10-52 cassette spans a 0.62 climbing gear to a 3.2 top gear, covering steep trails without a front shift. On gravel, an XPLR 10-44 cassette with a 40-tooth ring is a common balance of range and tight gear steps.

Compatibility notes

SRAM 12-speed road and MTB cassettes need an XD or XDR freehub driver and are not interchangeable with Shimano HG or Micro Spline. SRAM AXS also uses its own wireless protocol. As always, "12-speed" alone doesn't tell you how a bike rides — compare real gear ratios, gear inches and development in the table above and the calculator before choosing a setup.

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

Frequently Asked Questions

What is SRAM's 10-tooth cassette about?

SRAM 12-speed road and MTB cassettes start at a 10-tooth smallest cog, made possible by the XDR/XD freehub driver. A 10-tooth cog lets SRAM pair a smaller chainring while keeping a high top gear — for example a 46/33 with a 10-33 cassette covers a wide range.

What gear ratios does SRAM Force use?

SRAM Force eTap AXS commonly uses a 48/35 or 46/33 chainset with a 10-28, 10-30, 10-33 or 10-36 cassette. A 46/33 with 10-33 gives a low gear of 1.0 and a high gear of 4.6 — a very wide road range.

Is SRAM 1x good for road and gravel?

SRAM 1x (single chainring) drivetrains drop the front derailleur for simplicity and are very popular on gravel bikes. With a wide-range cassette like 10-44 or 10-52, a single 38-42 tooth chainring can cover most terrain. Use this calculator to check the gaps between gears.

Are SRAM and Shimano cassettes interchangeable?

Generally no. SRAM 12-speed road/MTB cassettes use the XD/XDR driver, while Shimano uses HG or Micro Spline. The shift cable pull and electronic protocols also differ. Compare the actual gear ratios here rather than assuming parts swap.

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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.