Technical Data

What you can expect to find on this page

Here you will find an overview of the most important facts and figures. In addition, the weight and efficiency of the SPEEDHUB are compared with that of a derailleur system. Finally, you will learn how to calculate the sprocket ratios.

Figures

Field Value
Number of gears 14
Gear increases even 13.6 %
Range of gears 526 %
Frame spacing 135mm (XL Version = 170mm, XXL Version = 190mm)
Number of spoke holes 32/36 (XL/XXL Version = 32 hole only)
Spoke flange distance 58 mm, symmetrical (XL/XXL Version = 93mm)
Spoke hole circle diameter Ø 100 mm
Spoke hole diameter Ø 2.7 mm
Spoke flange width 3.2 mm
Axle diameter at dropout 9.8 mm
Axle overall width CC 147 mm (XL Version = 182mm/XXL Version 202mm)
Hollow axle inner diameter CC Ø 5.5 mm, for quick release lever
Total axle width TS 171mm/TS long 179mm
Total axle width TS (XL Version) 206mm/TS long 214mm
Axle thread TS M10x1
Center disc mounting diameter Ø 52 mm
Mounting bolt hole circle diameter Ø 65 mm
Brake disc mounting bolts 4 x M8x0.75
Distance between dropout and center disc mount 16 mm (IS 1999)
Weight 1700g (CC), 1800g (CC EX), 1825g (CC DB)
Weight (XL Version/XXL Version) 1980g (XLCC DB OEM2) / 2005g (XXLCC DB OEM2)
Oil volume 25ml max.
Sprocket thread M34x6 P1, tolerance 6H
Sprocket type for bicycle chain 1/2" x 3/32” (ISO Nr. 082)
Number of sprocket teeth (16 standard) 13, 15, 16, 17 threaded- or 13-19 + 21 splined-spocket
Chainline (135mm/142mm) 55mm (57mm for 13T & all splined sprockets)
Chainline (XL/XXL Version) 73mm (75mm for 13T & all splined sprockets)
Smallest permissible gear ratios (Riders up to 100kg) 40/21, 36/19, 34/18, 32/17, 30/16, 28/15, 28/14, 26/13 (transm.- factor ~ 1.90)
(Riders over 100kg/tandem) 53/21, 48/19, 45/18, 42/17, 40/16, 38/15, 36/14, 34/13 (transm.-factor ~ 2.50)
Gates Carbondrive beltline 54.75mm (XL/XXL Version = 73mm)
Smallest permissible belt sprocket ratios (26”) 39/19, 39/20, 42/22, 46/24 (transmission factor ~ 1.90)
(Riders over 100kg/tandem) 46/19, 50/20, 55/22, 60/24 (transmission factor ~ 2.50)
Maximum input torque 130 Nm
Gear control by twist shifter (version right or left)
Twist shifter angle per gear change 21°/273°
Gear control transfer via two shifter cables (pull-pull system)
Shifter cable movement per gear change 7.4 mm/96.2 mm

Weight Comparison

The Rohloff SPEEDHUB 500/14 is with a weight of 120g per gear, the lightest gear hub on the market. The gear range is the same as high quality 27 gear derailleur systems due to the 14 gears within the hub being evenly spaced out at 13.6% increases.

With the Rohloff SPEEDHUB 500/14 there is no longer a need for the following parts:

  • Front and rear derailleur 
  • Two shifters including
  • Rear hub with Cassette
  • Small and middle chainrings
  • The total average weight of all these components is approx. 1600g.

The weight of a fitted Rohloff SPEEDHUB 500/14 CC OEM including twist shifter, shifter cables and cable guide is approx. 1820g.

The comparison between the Rohloff SPEEDHUB 500/14 and the derailleur system shows only a slight increase in weight. For that, the user receives a:

  • Service-free,
  • dirt-free full-encapsulated,
  • user-friendly gear system and
  • high reliability
  • alongwith a long life span.

Comparison of Mechanical Efficiency

The mechanical efficiency* and consequently the size of the loss of the Rohloff SPEEDHUB 500/14 is entirely comparable with that of the derailleur system.

The losses of a derailleur system consist of the friction caused by the bottom bracket, chain, cassette and the hub bearings. The amount of friction loss depends on the size of the sprockets, the angle of the chain line and condition of wear. In reality this proves to be 1 - 5%, leaving the derailleur system with a working efficiency lying between 95% and 99%.

The losses of the Rohloff SPEEDHUB 500/14 are caused by the fricion coming from the bottom bracket, chain and gearbox. Here, however, the chain runs in a straight line from just one chainring reducing sideways friction on the sprockets. Most of the friction occurs when all the planetary gear sets are used within the gearbox. The overall average loss of the gears within the Rohloff SPEEDHUB 500/14 is approximately 1 - 5%, leaving the working efficiency between 95% and 99%.

The Rohloff SPEEDHUB 500/14 is, therefore, consequently an optimum choice for the everyday and sports rider.

* More detailed info over the working efficiency is to be found here

Sprocket Ratios

The Rohloff SPEEDHUB 500/14 has a 526% range of gears, that means gear #14 is 5.26 times greater than gear #1. The 14 gears are evenly spaced out over this range in 13.6% increases. Through the choice of chainring and sprocket in use, the Rohloff SPEEDHUB 500/14 can be tuned for the specific riding purpose. The Rohloff SPEEDHUB 500/14 comes standard with a 16 tooth sprocket. 13, 15 and 17 tooth sprockets are available as alternatives.

In the following tables the distance travelled per crank revolution is listed for gears #1 and #14. The listed distance travelled per crank revolution is shown in the tables for a variety of sprocket ratios and wheel sizes (20", 26" and 28" wheels).

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

Distance travelled per crank revolution  = W x C / S x IGR

Formula key:
W = Wheel circumference
C = Chainring size
S = Sprocket size
IGR = Inner gear ratio listed in the following table 

Inner gear ratio IGR = hub revolutions per sprocket revolutions of the Rohloff SPEEDHUB 500/14

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

Inner gear ratio IGR = hub revolutions per sprocket revolutions of the Rohloff SPEEDHUB 500/14

Technical changes reserved!
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

Smallest Permissible Sprocket Ratios (solo 100kg)

The sprocket ratio on the Rohloff SPEEDHUB 500/14 (e.g. 42:16) converts the slow rotational speed at the crank, into a fast rotational speed at the sprocket and reduces the input torque for the Rohloff SPEEDHUB 500/14 in the same proportion.

To prevent overstraining the hub, a minimum sprocket factor of 1.90 must be upheld. With the available sprockets, these minumum ratios are achieved with: 53:21, 48:19,  45:18, 42:17, 40:16, 38:15.

These primary transmisison ratios resemble a singlespeed transmission of 22:40. Larger chainrings can be used without any exceptions.

Attention

The following sprocket ratios must not be undercut if the SPEEDHUB is used by a rider weighing more than 100kg, or mounted on a tandem application:  53:21, 48:19,  45:18, 42:17, 40:16, 38:15
This equates to a transmission factor of 2.50.