HM Bike DHM, Руководство пользователя

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Components of the bicycle
7
Components of the bicycle
Bottom bracket and cranks
The bottom bracket, crankset, gearside, chain and pedals form the bicycle’s
drive train. The bottom bracket consists of an axle, ball bearing, sealing rings
and bearing shells. These are contained in a unit known as a sealed bottom
bracket. This is enclosed and set up in the factory in such a way that it requi-
res no maintenance.
It is important that the cranks and bottom bracket do not exhibit any play
and are secure; these have to be regularly checked, otherwise there is
a danger of failure and accidents.
It is key that the cranks and bottom bracket are tight and secure, and this
should be checked on a regular basis to avoid any risks of breaking. The crank
bolts have to be tightened at the first inspection (after approx. 100 km). When
doing this, please refer to the table in the “Technical information” chapter and
the instructions provided by the respective manufacturer of your components. The useful life of the
chainrings is largely dependent on care and maintenance, as these parts are subject to wear.
Pedals
Normal, platform and clipless pedals are types of pedals that sometimes require specialist footwear.
Standard shoes can easily slide off the pedals, but specialist shoes also require practice, as it is
easy to fall off the bicycle before you are familiar with how they work. Shoes for system pedals are
attached to the pedal with a safety release, in a similar way to ski boots in skis. This connection is
released by twisting the heels sideways. You can set how much power is necessary to release the
foot from the pedal.
Ensure that you read the manufacturer’s instructions before using clipless pedals. Operating
this system should be first practiced and mastered in standing before riding the bicycle on
roads.
If your DHM bicycle is equipped with quick release pedals and quill pedals
(clips and straps), practice getting your feet in and out of the clips and using
the straps on a safe and quiet piece of land before the first ride. Tightly
secured pedal belts do NOT allow you to release your feet! Never practise this
in road traffic, otherwise this can lead to falls and serious accidents. Please
practice on a safe piece of land first.
Pedals are marked with “L” (left) and “R” (right). The right pedal (“R”) is threaded
into the right crank clockwise with the right thread, while the left (“L”) is threaded
anticlockwise into the left crank with the left thread – both with a 15mm wrench
towards the front wheel. Warning: Screwing the thread into the crank at an angle can render
the thread useless. Pedals have to be screwed in very tightly. Failure to do this increases the
risk of accidents!
If your DHM bicycle was supplied without the pedals pre-installed, these have to be attached with a
suitable wrench.
Clipless pedals which do not properly release are a safety hazard. Danger of falls!
Gears and chain
The gears allow you to change the drive of your bicycle to fit your terrain and personal requirements.
This part of the bicycle governs the relationship between the tempo of the pedaling and the speed of
the bicycle. You have to pay close attention to the manufacturer’s instruction manual both for internal
hub gears and external chain gears. You can read about this in the “Technology” chapter.
When using the standard commercial derailleur gears, there are several important rules aimed
at making the components durable and promoting safety, and these should always be observed:
Please do not use broken, worn or loose components – they can cause injury and should be
replaced or adjusted by a specialist retailer. You should also contact a specialist retailer if you hear
any unusual noises, notice that the gears are not changing smoothly or if the chain is showing signs
of wear!
A broken chain or gear system can lead to serious falls.
Operating derailleur gears
Always avoid using the smallest rear chainring with
the smallest front chainring at the same time, and the
same applies for the two largest. This exerts just as
much strain on the chain as it does on the chainrings –
it will wear quickly and can easily come off. You should
also not pedal backwards while changing gear as this
can seriously damage the gear system. And finally: use
a spoke protector – this reduces the risk that the chain
will slide between the spokes and chainring, damaging
the spokes. Take great care when switching into the
lowest gear with the largest rear chainring.
In the chain gear system, there is a right gear shifter for the rear derailleur and left one for the front
derailleur. It is important to keep pedaling evenly and not operate both shifters at the same time.
Very important: the chain should be oiled regularly. This is particularly vital after riding in the rain.
Gears with a large chain misalignment place a lot of strain on the chain. Whatever the case, chains
reach their wear limit after around 2000 km with chain gears and 3000 km with hub gears. At that
point, the chain should be changed.
Changing a chain requires specialist tools. Leave it up to your specialist retailer to select the chain
and fit it.
Brakes
The legal requirements for your bicycle’s brakes are
prescribed in article 65 of the StVZO. There are different
types of brakes depending on the type of bicycle. The
main categories are rim brakes, drum brakes and disc
brakes. For more information on operating and taking care
of the brakes, please refer to the manufacturer information
as well as the “Technology” chapter.
Be careful! Hub and drum brakes can only be retrofitted if
the fork has the “N” symbol. Long periods of braking heat up hub brakes, redu-
cing their effectiveness. Adapt your riding style to account for this!
Crank
Pedal and
clipless system
Rear derailleur
Front derailleur
Disc brakes
Rim brakes