Opel Astra 2013 Owner's Manual page 72

70 Storage
Push the release lever on the strap
retainer and remove the strap
retainer.
Prepare the bicycle for attachment
Note
The maximum width for the pedal
crank is 38.3 mm and the maximum
depth is 14.4 mm.
Rotate the left pedal (without a chain
cog) vertically downwards. The pedal
on the left pedal crank must be
horizontal.
The front bicycle must have its front
wheel facing left.
The rear bicycle must have its front
wheel facing right.
Attaching a bicycle to the rear carrier
system
With the rotary lever on the pedal
crank recess, roughly adapt the
adjustable pedal crank unit to the
protrusion of the pedal crank.
If the bicycle has straight pedal
cranks, unscrew the pedal crank unit
completely (position 5).
If the bicycle has curved pedal
cranks, screw in the pedal crank unit
all the way (position 1).