Gear inches and meters traveled per pedal stroke for every chainring and cog combination in eight common road, gravel and mountain bike drivetrains. Find your drivetrain in the summary, then scroll to its chart to see every gear.
Gear inches, the standard measure in the US, are the wheel’s diameter in inches × chainring ÷ cog: the size of the old high-wheeler your gear is equivalent to. Rollout, the measure used in Europe, is how far the bike travels with one full turn of the cranks: chainring ÷ cog × wheel circumference. Both come from the same formulas as our gear ratio calculator, with the actual tooth counts of each cassette from the Shimano and SRAM spec sheets, checked in October 2026. We use the real diameter of the wheel with its tire: 700 × 28 mm on the road (26.6 in diameter, 2,125 mm circumference), 700 × 40 mm on gravel (27.5 in, 2,198 mm) and 29 × 2.4” on the mountain bike (29.2 in, 2,326 mm).
Summary: easiest and hardest gear
Drivetrain
Tire
Easiest gear
Hardest gear
Range
50/34 with 11-34 (Shimano 12-speed)
700 × 28 mm
26.6 in (2.12 m), 34×34
121.0 in (9.66 m), 50×11
455 %
52/36 with 11-30 (Shimano 12-speed)
700 × 28 mm
32.0 in (2.55 m), 36×30
125.9 in (10.04 m), 52×11
394 %
48/35 with 10-33 (SRAM AXS)
700 × 28 mm
28.2 in (2.25 m), 35×33
127.8 in (10.20 m), 48×10
453 %
48/31 with 11-36 (Shimano GRX 2×)
700 × 40 mm
23.7 in (1.89 m), 31×36
120.2 in (9.59 m), 48×11
507 %
1× 40 with 10-44 (SRAM XPLR)
700 × 40 mm
25.0 in (2.00 m), 40×44
110.2 in (8.79 m), 40×10
440 %
1× 40 with 10-51 (Shimano)
700 × 40 mm
21.6 in (1.72 m), 40×51
110.2 in (8.79 m), 40×10
510 %
1× 32 with 10-52 (SRAM Eagle Transmission)
29 × 2.4” (61 mm)
17.9 in (1.43 m), 32×52
93.3 in (7.44 m), 32×10
520 %
1× 32 with 10-51 (Shimano Deore, SLX and XT)
29 × 2.4” (61 mm)
18.3 in (1.46 m), 32×51
93.3 in (7.44 m), 32×10
510 %
The range is the hardest gear divided by the easiest: the higher it is, the more terrain the drivetrain covers. For 1× setups we’ve used the most common chainring; for a different one, see its column in the charts below.
Road
50/34 with 11-34 (Shimano 12-speed)
Cog
50t chainring
34t chainring
11
121.0 in (9.66 m)
82.3 in (6.57 m), cross-chained
12
110.9 in (8.85 m)
75.4 in (6.02 m), cross-chained
13
102.4 in (8.17 m)
69.6 in (5.56 m)
14
95.1 in (7.59 m)
64.7 in (5.16 m)
15
88.8 in (7.08 m)
60.4 in (4.82 m)
17
78.3 in (6.25 m)
53.3 in (4.25 m)
19
70.1 in (5.59 m)
47.6 in (3.80 m)
21
63.4 in (5.06 m)
43.1 in (3.44 m)
24
55.5 in (4.43 m)
37.7 in (3.01 m)
27
49.3 in (3.93 m)
33.5 in (2.68 m)
30
44.4 in (3.54 m), cross-chained
30.2 in (2.41 m)
34
39.2 in (3.12 m), cross-chained
26.6 in (2.12 m)
52/36 with 11-30 (Shimano 12-speed)
Cog
52t chainring
36t chainring
11
125.9 in (10.04 m)
87.1 in (6.95 m), cross-chained
12
115.4 in (9.21 m)
79.9 in (6.37 m), cross-chained
13
106.5 in (8.50 m)
73.7 in (5.88 m)
14
98.9 in (7.89 m)
68.5 in (5.46 m)
15
92.3 in (7.37 m)
63.9 in (5.10 m)
16
86.5 in (6.91 m)
59.9 in (4.78 m)
17
81.4 in (6.50 m)
56.4 in (4.50 m)
19
72.9 in (5.82 m)
50.5 in (4.03 m)
21
65.9 in (5.26 m)
45.6 in (3.64 m)
24
57.7 in (4.60 m)
39.9 in (3.19 m)
27
51.3 in (4.09 m), cross-chained
35.5 in (2.83 m)
30
46.2 in (3.68 m), cross-chained
32.0 in (2.55 m)
48/35 with 10-33 (SRAM AXS)
Cog
48t chainring
35t chainring
10
127.8 in (10.20 m)
93.2 in (7.44 m), cross-chained
11
116.2 in (9.27 m)
84.7 in (6.76 m), cross-chained
12
106.5 in (8.50 m)
77.7 in (6.20 m)
13
98.3 in (7.85 m)
71.7 in (5.72 m)
14
91.3 in (7.28 m)
66.6 in (5.31 m)
15
85.2 in (6.80 m)
62.1 in (4.96 m)
17
75.2 in (6.00 m)
54.8 in (4.37 m)
19
67.3 in (5.37 m)
49.0 in (3.91 m)
21
60.9 in (4.86 m)
44.4 in (3.54 m)
24
53.3 in (4.25 m)
38.8 in (3.10 m)
28
45.6 in (3.64 m), cross-chained
33.3 in (2.66 m)
33
38.7 in (3.09 m), cross-chained
28.2 in (2.25 m)
Gravel
48/31 with 11-36 (Shimano GRX 2×)
Cog
48t chainring
31t chainring
11
120.2 in (9.59 m)
77.6 in (6.19 m), cross-chained
12
110.2 in (8.79 m)
71.2 in (5.68 m), cross-chained
13
101.7 in (8.12 m)
65.7 in (5.24 m)
14
94.4 in (7.54 m)
61.0 in (4.87 m)
15
88.1 in (7.03 m)
56.9 in (4.54 m)
17
77.8 in (6.21 m)
50.2 in (4.01 m)
19
69.6 in (5.55 m)
44.9 in (3.59 m)
21
63.0 in (5.02 m)
40.7 in (3.24 m)
24
55.1 in (4.40 m)
35.6 in (2.84 m)
28
47.2 in (3.77 m)
30.5 in (2.43 m)
32
41.3 in (3.30 m), cross-chained
26.7 in (2.13 m)
36
36.7 in (2.93 m), cross-chained
23.7 in (1.89 m)
1× with 10-44 (SRAM XPLR)
Cog
42t chainring
40t chainring
38t chainring
10
115.7 in (9.23 m)
110.2 in (8.79 m)
104.7 in (8.35 m)
11
105.2 in (8.39 m)
100.2 in (7.99 m)
95.1 in (7.59 m)
13
89.0 in (7.10 m)
84.7 in (6.76 m)
80.5 in (6.42 m)
15
77.1 in (6.15 m)
73.4 in (5.86 m)
69.8 in (5.57 m)
17
68.0 in (5.43 m)
64.8 in (5.17 m)
61.6 in (4.91 m)
19
60.9 in (4.86 m)
58.0 in (4.63 m)
55.1 in (4.40 m)
21
55.1 in (4.40 m)
52.5 in (4.19 m)
49.8 in (3.98 m)
24
48.2 in (3.85 m)
45.9 in (3.66 m)
43.6 in (3.48 m)
28
41.3 in (3.30 m)
39.3 in (3.14 m)
37.4 in (2.98 m)
32
36.2 in (2.88 m)
34.4 in (2.75 m)
32.7 in (2.61 m)
38
30.4 in (2.43 m)
29.0 in (2.31 m)
27.5 in (2.20 m)
44
26.3 in (2.10 m)
25.0 in (2.00 m)
23.8 in (1.90 m)
1× with 10-51 (Shimano)
Cog
42t chainring
40t chainring
38t chainring
10
115.7 in (9.23 m)
110.2 in (8.79 m)
104.7 in (8.35 m)
12
96.4 in (7.69 m)
91.8 in (7.33 m)
87.2 in (6.96 m)
14
82.6 in (6.59 m)
78.7 in (6.28 m)
74.8 in (5.97 m)
16
72.3 in (5.77 m)
68.9 in (5.49 m)
65.4 in (5.22 m)
18
64.3 in (5.13 m)
61.2 in (4.88 m)
58.1 in (4.64 m)
21
55.1 in (4.40 m)
52.5 in (4.19 m)
49.8 in (3.98 m)
24
48.2 in (3.85 m)
45.9 in (3.66 m)
43.6 in (3.48 m)
28
41.3 in (3.30 m)
39.3 in (3.14 m)
37.4 in (2.98 m)
33
35.1 in (2.80 m)
33.4 in (2.66 m)
31.7 in (2.53 m)
39
29.7 in (2.37 m)
28.2 in (2.25 m)
26.8 in (2.14 m)
45
25.7 in (2.05 m)
24.5 in (1.95 m)
23.3 in (1.86 m)
51
22.7 in (1.81 m)
21.6 in (1.72 m)
20.5 in (1.64 m)
Mountain
1× with 10-52 (SRAM Eagle Transmission)
Cog
34t chainring
32t chainring
30t chainring
10
99.1 in (7.91 m)
93.3 in (7.44 m)
87.4 in (6.98 m)
12
82.6 in (6.59 m)
77.7 in (6.20 m)
72.9 in (5.81 m)
14
70.8 in (5.65 m)
66.6 in (5.32 m)
62.5 in (4.98 m)
16
61.9 in (4.94 m)
58.3 in (4.65 m)
54.7 in (4.36 m)
18
55.1 in (4.39 m)
51.8 in (4.13 m)
48.6 in (3.88 m)
21
47.2 in (3.77 m)
44.4 in (3.54 m)
41.6 in (3.32 m)
24
41.3 in (3.29 m)
38.9 in (3.10 m)
36.4 in (2.91 m)
28
35.4 in (2.82 m)
33.3 in (2.66 m)
31.2 in (2.49 m)
32
31.0 in (2.47 m)
29.1 in (2.33 m)
27.3 in (2.18 m)
38
26.1 in (2.08 m)
24.5 in (1.96 m)
23.0 in (1.84 m)
44
22.5 in (1.80 m)
21.2 in (1.69 m)
19.9 in (1.59 m)
52
19.1 in (1.52 m)
17.9 in (1.43 m)
16.8 in (1.34 m)
1× with 10-51 (Shimano Deore, SLX and XT)
Cog
34t chainring
32t chainring
30t chainring
10
99.1 in (7.91 m)
93.3 in (7.44 m)
87.4 in (6.98 m)
12
82.6 in (6.59 m)
77.7 in (6.20 m)
72.9 in (5.81 m)
14
70.8 in (5.65 m)
66.6 in (5.32 m)
62.5 in (4.98 m)
16
61.9 in (4.94 m)
58.3 in (4.65 m)
54.7 in (4.36 m)
18
55.1 in (4.39 m)
51.8 in (4.13 m)
48.6 in (3.88 m)
21
47.2 in (3.77 m)
44.4 in (3.54 m)
41.6 in (3.32 m)
24
41.3 in (3.29 m)
38.9 in (3.10 m)
36.4 in (2.91 m)
28
35.4 in (2.82 m)
33.3 in (2.66 m)
31.2 in (2.49 m)
33
30.0 in (2.40 m)
28.3 in (2.26 m)
26.5 in (2.11 m)
39
25.4 in (2.03 m)
23.9 in (1.91 m)
22.4 in (1.79 m)
45
22.0 in (1.76 m)
20.7 in (1.65 m)
19.4 in (1.55 m)
51
19.4 in (1.55 m)
18.3 in (1.46 m)
17.1 in (1.37 m)
How to use the chart
A different tire. Gearing grows with wheel diameter: going from 25 to 32 mm on a road bike makes every gear 2 % taller, and from 28 to 40 mm, 3.4 % taller. On 27.5” (650b) wheels, gears are 5 % shorter than on 29”.
A different drivetrain. If your cassette isn’t here, multiply chainring ÷ cog by your wheel diameter in inches: with 26.6 in, a 39×21 is 39 ÷ 21 × 26.6 = 49.4 gear inches (3.95 m of rollout). The calculator includes more than 40 cassettes and lets you type in your own.
Cross-chaining. We only flag it on double-chainring drivetrains. On a 1× setup the chain runs at a bit of an angle at the extremes, but it’s designed to use every cog.
For climbing. On 8-10 % grades at an easy pace, most riders need about 25 gear inches (2 m) or less; check it against your watts and weight in the calculator’s “Can I climb with it?” section.
To turn gear inches into speed, multiply by your cadence and by 0.002975 to get mph (rollout in meters × cadence × 0.06 gives km/h), or look it up directly in the speed by cadence chart. For a sheet with every chainring and cog to hang in your garage, use the printable gear chart; to understand which gear to choose and why, read the bike gearing guide and the one on 1× vs. 2×. For long climbs, the guide to gearing for climbing tells you what you need based on your weight and watts.
Frequently asked questions
How many gear inches is a 34x34?
With 28 mm tires, 26.6 gear inches, or 2.12 m per pedal stroke. It's the easiest gear on a 50/34 compact with an 11-34 cassette, and at 80 rpm it gives you about 6.3 mph (10.2 km/h).
Which is easier, a 34x34 or a 1× 40 with a 44?
They're close: the 34×34 on a road bike is 26.6 gear inches (2.12 m) and the 40×44 on a gravel bike with 40 mm tires is 25.0 gear inches (2.00 m). The gravel gear is about 6 % easier.
What does "cross-chained" mean in the chart?
It's a combination of the big chainring with the two largest cogs, or the small chainring with the two smallest. The chain runs at a sharp angle, gets noisier and wears faster, and there's almost always a nearly identical gear on the other chainring.
