The R8C and R15C come with a 14 speed Rohloff Rear wheel.
The hub uses a 148mm wide axle.
The hub is secured to the swingarm by special Rohloff 7mm
bolts, spacers and Nord lock washers on each side.
The special bolt and spacer are different on each side.
Left Bolt: M7 X 30mm (Silver Bolt)
Right Bolt: M7 X 36mm (Black Bolt)
The bolts, Nord lock washers and spacers must be
installed in correct order and on correct side of wheel.
Failure to do so may damage the hub and frame and
cause injury to rider.
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Optibike R8C and R15C Manual