SRAM Gear Ratio Calculator

Gear inches, development and speed for current SRAM groupsets: Rival, Force and RED AXS (including RED E1), XPLR 1x and Eagle Transmission.

By Jonas Lindemann · Updated · How we build our calculators

Your gearing

SRAM Force AXS · 48/35 · 10-36 (12s)

Easiest gear

35 × 36

26.0 in

0.97 · 2.08 m

7.0 mph at 90 rpm

Hardest gear

48 × 10

128.5 in

4.80 · 10.25 m

34.4 mph at 90 rpm

494%
24 · 20 usable
17%35×28 → 35×24
39T

Climbing: at 200 W and 187 lb, your easiest gear keeps 70 rpm up to 9.1%. For 10% you'd want ≈ 24.0 in. Climbing check ↓

: 35×10, 35×11, 48×32, 48×36

: No near-duplicate gears (within 2%).

Chainrings
Cassette · 12 cogs

Type a number to change it, × or Delete to remove it, + to add the next size.

mm

90 rpm

Units

Crank length, chainstay, chain angle
Chain length for this setup

Climbing check

Is your easiest gear easy enough? Set the gradient, your weight and the power you can hold.

%
lb
W
rpm

Borderline. On 10% you ride 65 rpm in the easiest gear, a little under your 70 rpm.

Climbing speed 5.0 mph in 35 × 36. Your easiest gear keeps 70 rpm up to 9.1%.

To hold your cadence here, the easiest gear should be ≈ 24.0 in, e.g. 35 × 40 or 32 × 36.

Cadence in the easiest gear at 200 W, 187 lb. Target 70 rpm.
GradientCadence (rpm)Speed (mph)
4%13610.6
6%1017.8
8%796.1
10%655.0
12%554.2
15%443.4

Steady climb, no wind. Rolling resistance 0.004, CdA 0.35 m², air density 1.2 kg/m³, drivetrain 97.5% efficient.

Speed and cadence

Cadence for a speed

mph

Cadence for 25.0 mph in 48 × 10:

65 rpm

Gear for a speed

mph
rpm

Closest gears for 20.0 mph at 90 rpm:

  • 35 × 1319.3 mph
  • 48 × 1720.2 mph
  • 35 × 1220.9 mph

Gear chart

Gear inches (in)40608010012048T13%14%17%14%11%12%13%15%8%9%10%36322824211917151312111035T13%14%17%14%11%12%13%15%8%9%10%363228242119171513121110

Each dot is one gear, labelled with the cog. The % under the line is the step to the next harder gear. Swipe sideways to see the whole chart.

  • Cross-chained
  • Near-duplicate of a gear on the other ring
  • Closest gears to your target speed

Suggested shifting sequence

Easiest to hardest with one front shift, without cross-chained or duplicate gears. 15 gears, average step 12%.

  1. 35×36
  2. +13%35×32
  3. +14%35×28
  4. +17%35×24
  5. +14%35×21
  6. +11%35×19
  7. Shift to the 48T and 2 cogs bigger at the back (+9%)48×24
  8. +14%48×21
  9. +11%48×19
  10. +12%48×17
  11. +13%48×15
  12. +15%48×13
  13. +8%48×12
  14. +9%48×11
  15. +10%48×10

Gear table

Gear inches (in)
Cog35T48T
10T93.7128.5
11T85.2116.8
12T78.1107.1
13T72.198.8
15T62.585.7
17T55.175.6
19T49.367.6
21T44.661.2
24T39.053.5
28T33.545.9
32T29.340.2
36T26.035.7

Cross-chainedNear-duplicate of a gear on the other ring

Current SRAM groupsets compared

Easiest and hardest gear on a 28-622 (700x28c) wheel.

GroupsetEasiestHardestRange
Rival AXS
46/33 · 10-36 (12s)
24.5 in123.1 in502%
Rival AXS
48/35 · 10-30 (12s)
31.2 in128.5 in411%
Force AXS
48/35 · 10-36 (12s)
26.0 in128.5 in494%
Force AXS
48/35 · 10-33 (12s)
28.4 in128.5 in453%
Force AXS
50/37 · 10-28 (12s)
35.4 in133.8 in378%
RED AXS E1
50/37 · 10-33 (12s)
30.0 in133.8 in446%
RED AXS E1
52/39 · 10-28 (12s)
37.3 in139.2 in373%
RED AXS E1
54/41 · 10-30 (12s)
36.6 in144.5 in395%
RED AXS E1
56/43 · 10-33 (12s)
34.9 in149.9 in430%
Force 22
50/34 · 11-32 (11s)
28.4 in121.7 in428%
Rival XPLR AXS
40T · 10-44 (12s)
24.3 in107.1 in440%
Force XPLR AXS
42T · 10-44 (12s)
25.6 in112.4 in440%
RED XPLR AXS 13s
46T · 10-46 (13s)
26.8 in123.1 in460%
Rival AXS Wide
43/30 · 10-36 (12s)
22.3 in115.1 in516%
Eagle Transmission (mullet)
40T · 10-52 (12s)
20.6 in107.1 in520%
Eagle Transmission XX / X0
32T · 10-52 (12s)
16.5 in85.7 in520%
Eagle Transmission GX
32T · 10-52 (12s)
16.5 in85.7 in520%
GX Eagle
32T · 10-52 (12s)
16.5 in85.7 in520%
GX Eagle
32T · 10-50 (12s)
17.1 in85.7 in500%
NX Eagle
32T · 11-50 (12s)
17.1 in77.9 in455%
GX 11s
32T · 10-42 (11s)
20.4 in85.7 in420%

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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