The Greenspeed Anura IGH takes the internal gearing one step further. As well as discarding the front derailleur, we now discard the rear derailleur and use a much cleaner method of changing gear than pushing the chain from one sprocket to another. IGH means Internally Geared Hub, whereby the gears are inside the hub instead of being exposed to road muck on the outside of the wheel. Almost any IGH can be used in the Anura, from a 3 speed Sturmey Archer to the 14 speed Rolhoff hub with a 500 percent range.
However our standard set-up uses the Nu-Vinci continuously variable hub, the N360, plus the Sclumpf Speed Drive. This hub is an incredibly quiet and smooth hub with NO steps or clunks in changing gear as there are no gears inside the hub! It is continuously variable between the ratios of 1:0.5 to 1:1.8 (360 percent) and with the Schlumpf, this range is increased to 594 percent, or from 14 to 86 inches. Like the Schumpf, the ratio can be changed while stationary as well as under power.
The complete absence of a rear derailleur or tensioner means not only less maintenance, but a more than doubling of the standard ground clearance of the SL from 3” to 6.5” with the standard wheels.