The Pendix electric assist kit is a very neat German-made system – it’s a crank drive kit, but unlike most crank drives, it can be fitted to conventional frames with no modification. The battery fits to a holder that fits to the bottle bosses or other convenient mounting points. A simple control knob on the battery sets the power output, and that’s it – it’s beautifully simple.
Because of this, it’s perfectly suited to bikes with hub gears, recumbents or any bikes where a hub motor won’t fit. Fitting is usually simple with normal bike tools – or I can do the fitting for free.
The Pendix battery simply changes colour to show how full it is.