Buffalo Benelli Classica Series, Инструкция по эксплуатации

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The bike chain must not be on the smallest chain ring at the front and
the small outer rear sprocket wheel simultaneously. The bike chain must not be on the largest
chain ring at the front and large inner sprocket wheel at the rear simultaneously. Otherwise
the bike chain could jump off.
Never pedal backwards when changing gears as you could damage
the gear-shift mechanism.
Only make changes to the gear-shift system carefully and in small increments. If settings are
made incorrectly, the bike chain could jump off the sprocket wheel and cause serious injury. If
you are unsure about what to do, have this work carried out by a professional bike workshop.
NOTE:
Even if the gear system is perfectly adjusted, it can produce noise if the chain is
running at an extremely sharp angle. This does not mean it is defective and does not damage
the drive. As soon as the chain is at a shallower angle, the noise should dissipate.
Hub gears
This User Manual describes the handling of typical, commercially available gear-shift
components of a gear hub on a city or trekking bike. For other components, refer to the
separate information or enclosed instructions.
If you have questions on installation, adjustment, maintenance and operation, please consult a
specialist cycle shop.
If the hub is mounted on the frame, the correct fixing washers must be
used on both sides and the hub nuts must be tightened to the prescribed torque (see
"Technical data").
If the fixing washers are used on one side only or the hub nuts are
tightened incorrectly, the hub may mal-function: It could rotate. This could cause the shifting
cable to pull the handlebar to one side and cause a serious accident.