Tyres; Rims In Conjunction With Rim Brakes; Brake Pads; Brake Discs - Bosch Drive Unit Speed Manual Original

27.3 Tyres

Due to their function, bike tyres are subject to wear. This
depends on how the bike is used and the rider can influ-
ence this significantly.
› Do not brake so sharply that the wheels lock.
› Check the tyre pressure regularly. The maximum
permissible tyre pressure, and normally also the
minimum permissible pressure, can be found on
the tyre wall.
› If necessary, inflate the tyre up to the specified
value. This reduces wear.
› Do not expose the tyres to things that can damage
them such as sunlight, petrol, oil, etc.

27.4 Rims in conjunction with rim brakes

Owing to the interaction of the rim brake with the rim, not
only the brake pad but also the rim is subject to function-
related wear. If fine cracks appear or the rim flanges
deform when the tyre pressure increases, this indicates
increased wear. Wear indicators on the rim allow its wear
condition to be easily identified.
› Check the wear condition of the rim at regular in-
tervals (see ➠ Chapter 16.3 "Checking the rims").

27.5 Brake pads

The brake pads on rim, roller, drum and disc brakes are
subject to wear, the extent of which depends on how the
bike is used. If the bike is ridden in hilly regions, or used
in a sporty manner, the brake pads may need to be re-
placed more often. Check the wear condition of the pads
regularly and, if necessary, have them replaced by a pro-
fessional bike workshop.
58 I General User Manual

27.6 Brake discs

Brake discs also wear out as a result of intensive braking,
or during the course of time. Find out from the manufac-
turer of your brakes or your specialist cycle shop about
the respective wear limits. You can have worn brake discs
replaced at a professional bike workshop.

27.7 Bike chains or toothed belts

The bike chain is subject to function-related wear the ex-
tent of which depends on care/maintenance and how the
bike is used (mileage, rain, dirt, salt, etc.).
› To increase the service life of the bike, clean the
bike chains and toothed belts regularly and lubri-
cate the chain.
› Have the chain replaced by a professional bike
workshop once its wear limit has been reached
(see ➠ Chapter 20 "Bike chain").
27.8 Chainrings, sprocket wheels and
jockey wheels
In bikes with derailleur gears, the sprocket wheels, chain-
rings and jockey wheels are subject to function-related
wear. The extent of the wear depends on care/mainte-
nance and how the bike is used (mileage, rain, dirt, salt,
etc.).
› To increase the service life of the bike, you should
clean and lubricate these parts regularly.
› Have them replaced by a professional bike work-
shop once their wear limit has been reached.

27.9 Lamps of lighting set

Bulbs and other lamps are subject to function-related wear
and therefore may need to be replaced.
› In case you need to replace damaged bulbs, always
carry spare ones with you.