Gear inches in combination with internal hubs
Some typical tyre dimensions:
Circumference in meter
Brompton (Standard)
1.32
Birdy 18" (Marathon Race)
1.36
20" 40-406
1.53
20" 47-406
1.55
20" 54-406 (20"x1.75)
1.59
24" 47-507
1.86
24" 54-507
1.92
26" 40-559
2.00
26" 57-559
2.10
28" 25-622
2.13
28" 37-622
2.19
28" 40-622
2.22
28" 50-622
2.28
28" 60-622
2.35
Input:
Circumference of rear wheel (in meter)
Tooth count of front chainring
Rear cog
Output
:
meters per one revolution of crank
1 : 1
m-d
s-d
h-s-d
Single-Speed
Output
:
meters per one revolution of crank
3 speed hub (SRAM Spectro)
1 : 1
m-d
s-d
h-s-d
ratio
gear range of the hub in %
gear range in combination with speed-drive
in %
gear range in combination with mountain-drive or high-speed-drive
in %
1. speed
0.73
186
307
466
2. speed
1.00
3. speed
1.36
Output
:
meters per one revolution of crank
3 speed hub
(Sturmey
Archer S3X)
1 : 1
m-d
s-d
h-s-d
ratio
gear range of the hub in %
gear range in combination with speed-drive
in %
gear range in combination with mountain-drive or high-speed-drive
in %
1. speed
0.63
160
264
400
2. speed
0.75
3. speed
1.00
Output
:
meters per one revolution of crank
5 speed hub
(SRAM
Spectro)
1 : 1
m-d
s-d
h-s-d
ratio
gear range of the hub in %
gear range in combination with speed-drive
in %
gear range in combination with mountain-drive or high-speed-drive
in %
1. speed
0.67
224
369
560
2. speed
0.78
3. speed
1.00
4. speed
1.28
5. speed
1.50
Output
:
meters per one revolution of crank
7 speed hub
(SRAM
Spectro)
1 : 1
m-d
s-d
h-s-d
ratio
gear range of the hub in %
gear range in combination with speed-drive
in %
gear range in combination with mountain-drive or high-speed-drive
in %
1. speed
0.57
305
504
763
2. speed
0.68
3. speed
0.81
4. speed
1.00
5. speed
1.24
6. speed
1.48
7. speed
1.74
Output
:
meters per one revolution of crank
7 speed hub
(Shimano
Nexus 7)
1 : 1
m-d
s-d
h-s-d
ratio
gear range of the hub in %
gear range in combination with speed-drive
in %
gear range in combination with mountain-drive or high-speed-drive
in %
1. speed
0.63
244
403
611
2. speed
0.74
3. speed
0.84
4. speed
0.99
5. speed
1.15
6. speed
1.34
7. speed
1.55
Output
:
meters per one revolution of crank
8 speed hub
(Shimano
Nexus Inter-8)
1 : 1
m-d
s-d
h-s-d
ratio
gear range of the hub in %
gear range in combination with speed-drive
in %
gear range in combination with mountain-drive or high-speed-drive
in %
1. speed
0.53
306
506
766
2. speed
0.64
3. speed
0.75
4. speed
0.85
5. speed
1.00
6. speed
1.22
7. speed
1.42
8. speed
1.62
Output
:
meters per one revolution of crank
9 speed hub
(SRAM
i-Motion 9)
1 : 1
m-d
s-d
h-s-d
ratio
gear range of the hub in %
gear range in combination with speed-drive
in %
gear range in combination with mountain-drive or high-speed-drive
in %
1. speed
0.54
340
561
851
2. speed
0.62
3. speed
0.73
4. speed
0.85
5. speed
1.00
6. speed
1.17
7. speed
1.38
8. speed
1.61
9. speed
1.84
Output
:
meters per one revolution of crank
11 speed hub
(Shimano
Alfine 11)
1 : 1
m-d
s-d
h-s-d
ratio
gear range of the hub in %
gear range in combination with speed-drive
in %
gear range in combination with mountain-drive or high-speed-drive
in %
1. speed
0.527
409
674
1021
2. speed
0.681
3. speed
0.770
4. speed
0.878
5. speed
0.995
6. speed
1.134
7. speed
1.292
8. speed
1.462
9. speed
1.667
10. speed
1.888
11. speed
2.153
Output
:
meters per one revolution of crank
Rohloff
Speedhub
1 : 1
m-d
s-d
h-s-d
ratio
gear range of the hub in %
gear range in combination with speed-drive
in %
gear range in combination with mountain-drive or high-speed-drive
in %
1. speed
0.28
526
868
1315
2. speed
0.32
3. speed
0.36
4. speed
0.41
5. speed
0.46
6. speed
0.53
7. speed
0.60
8. speed
0.68
9. speed
0.77
10. speed
0.88
11. speed
1.00
12. speed
1.14
13. speed
1.29
14. speed
1.47
Output
:
meters per one revolution of crank
NuVinci CVP
(continously
variable
planetary)
1 : 1
m-d
s-d
h-s-d
ratio
gear range of the hub in %
gear range in combination with speed-drive
in %
gear range in combination with mountain-drive or high-speed-drive
in %
0.50
350
578
875
1.75