The Speedhub 36 500/14 has a gear range of 526%, which means that the highest gear is 5.26 times higher than the lowest gear. Across the entire range of the 14 gears shifts increase or decrease in even increments of 13.6%.
The individual gear ratios, the single increments and the entire range of gears are determined by the design of the internal gear system and cannot be changed. Neverthless you can customize your gearing by substituting different chainrings and cogs for easier or higher gearing.
The hub is specified with a 16 tooth rear sprocket but 15 and 17 tooth steel cogs and 15, 16 and 17 tooth aluminum sprockets are available. Recommended chainrings are 42, 44 or 46 teeth.
The Speedhub 500/14 has been developed for racing which means that it can handle the heavy loads encountered during competition. Maximum torque loads in extreme conditions can be as high as 250 Nm on the crank (=150 kg on the pedal). This will not damage the the gear box because the high chainwheel/sprocket ratio transforms the low number of crank revolutions into a higher number of revolutions at the cog. The higher the chainwheel/sprocket revolution ratio, the lower the torque transmitted to the gearbox. For this reason you must not use a chainring/cog ratio of less than 2.4.
The chart below displays gear developments in meters for several chainwheel and sprocket combinations, with typical MTB wheels.
To maintain optimum functionality and safety of the Speedhub, the lowest allowable gear combinations are 42/17, 38/16 or 36/15. These are the equivalent to a 22/32 combination on a conventional drivetrain.
There is no limit whatsoever for higher ratios which means that you can mount bigger chainrings than shown on the table for extreme downhill racing.
|Sprockets/Cogs||17 Tooth||16 Tooth||15 Tooth|
|36 Tooth||----||----||1,38m- 7,25m|
|38 Tooth||----||1,36m- 7,66m||1,45m- 7,66m|
|40 Tooth||----||1,43m- 7,56m||1,53m- 8,06m|
|42 Tooth||1,42m- 7,45m||1,50m- 7,92m||1,60m- 8,45m|
|44 Tooth||1.48m- 7,81m||1,58m- 8,30m||1,68m- 8,85m|
|46 Tooth||1,55m- 8,16m||1,65m- 8,69m||1,76m- 9,25m|
|48 Tooth||1,62m- 8,52m||1,72m- 9,05m||1,83m- 9,66m|
|50 Tooth||1,69m- 8,87m||1,79m- 9,43m||1,91m- 10.06m|
|52 Tooth||1,75m- 9,23m||1,89m- 9,81m||1,99m- 10,46m|
|54 Tooth||1,82m- 9,58m||1,93m- 10,18m||2,06m- 10,86m|
|56 Tooth||1,89m- 9,94m||2,01m- 10,56m||2,14m- 11,26m|
|58 Tooth||1,95m- 10,29m||2,08m- 10,94m||2,22m- 11,67m|
|60 Tooth||2,02m- 10,65m||2,15m- 11,32||2,29m- 12,07m|
The SPEEDHUB 500/14 has been developed for both pros and performance-oriented hobby cyclists who can appreciate it because of its reliability, perfect single gear ratios, wide range of gears, low maintenance and easy operation.
|Articles by Sheldon Brown and others|
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