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SPROCKET RATIOS

The Rohloff SPEEDHUB 500/14 has a 526% overall range of gears, that means gear #14 is 5.26 times greater than gear #1. All 14 gears are evenly spaced throughout this range in 13.6% increments. Although this range of gears is fixed, through experimenting with different chainrings and sprockets, it is possible to tailor the transmission of the Rohloff SPEEDHUB 500/14 to your specific cycling requirements. The Rohloff SPEEDHUB 500/14 comes as standard fitted with a 16 tooth sprocket. 13, 14, 15, 17, 18, 19 and 21 tooth sprockets are also available as alternatives for gears #1 and #14. The listed distance traveled per crank revolution is shown in the Gear Meters Table for a variety of sprocket ratios and wheel sizes (20", 26", 650b, 28", 29" and Fatbike wheels).

Should the particular wheel/sprocket/chainring size and gear not be listed in the tables, then the following formula can be used to calculate the exact distance traveled per crank revolution of the Rohloff SPEEDHUB 500/14:

Distance traveled per crank revolution = W x C / S x IGR.

Formula key:
W = Wheel circumference
C = Chainring size
S= Sprocket size


IGR = Hub revolutions per sprocket revolution of the Rohloff SPEEDHUB 500/14

Gear: 1 2 3 4 5 6 7 8 9 10 11 12 13 14
IGR 0,279 0,316 0,360 0,409 0,464 0,528 0,600 0,682 0,774 0,881 1,000 1,135 1,292 1,467

The tables or the following formula can be used to compare the Rohloff SPEEDHUB 500/14 to a derailleur gear system:

Ratio of the derailleur gear system = C / S
Ratio of the Rohloff SPEEDHUB 500/14 = IGR x C / S


Smallest permissible sprocket ratios


The primary sprocket ratio used with the Rohloff SPEEDHUB 500/14 (e.g. 42:16) converts the slow rotational speed at the crank into a fast rotational speed at the rear sprocket and reduces the input torque for the Rohloff SPEEDHUB 500/14 in the same proportion. To prevent overstraining the hub, a minimum factor of 1.9 must be used. This minimum factor equates to a primary transmission ratio of:- 40:21, 36:19, 34:18, 32:17, 30:16, 28:15, 26:14 and 26:13. These SPEEDHUB 500/14 ratios resemble a derailleur transmission of 20:40.

Larger chainrings can be used without exceptions.

Attention!

If mounted on a tandem or if the rider weighs over 100kg, the minimum factor of 2.50 must not be undercut. This equates to primary transmission ratios of:- 32:13, 35:14, 38:15, 40:16, 42:17, 45:18, 48:19 and 53:21.

Again, larger chainrings can be used without exceptions.

Derailleur gears in comparison to Rohloff SPEEDHUB 500/14 (20kB)
Rohloff SPEEDHUB 500/14 in comparison to derailleur gears (21kB)