HM Bike DHM, User Manual

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Carbon components
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Carbon components
If you have a carbon frame or carbon components on your bicycle, you have purchased a product
that is particularly stable and light.
These components are usually identifiable by their clear black surface fibers, which are constructed
and interwoven in different patterns. As is the case with all particularly light parts, there are different
aspects to consider than with metal components when constructing, servicing, cleaning, using and
transporting your bicycle.
Carbon is a strong material for making very stable components.
!!! In contrast to metal components, you are NOT able to see if fibers are damaged, such as after a
fall! After excess stress, like following a fall, carbon parts can suddenly break without any warning.
This can cause very serious accidents.
Therefore, it is vital to regularly check carbon parts.
Listen for any cracking or other sounds during riding •
Look for deep scratches, holes or splinters •
Check if the stiffness of parts has changed •
Look for any areas where paint or fibers are coming off or where cracks and flaws in the surface •
are visible.
If any of the above apply, then it is possible that your bicycle is damaged.
You should not ride the bicycle until it has been inspected by a specialist!
As a basic rule, no lubricants may be used during assembly. There are special synthetic assembly
pastes for assembling carbon parts. These ensure that parts are solid and safely secured against
twisting. Fastening screws also do not have to be so tightly fastened, as this could also damage
parts which are sensitive to pressure.
For instance, the frame may not be clamped in a work stand by a single tube. Affix a seat post secu -
rely in the frame and then attach this in a workstand. You should also not cut new threads in carbon
parts, while the seat tube may also not be reamed inside.
Carbon frames are not suitable for installing children’s seats!
When using or assembling carbon parts, please pay particular attention to the torques printed on
components. You will find additional information on torques in the “Technical information” chapter.
Please be particularly careful when checking your bicycle. Broken carbon parts have very small
fibers and splinters that can cause very painful and dangerous injuries!
In principle, carbon frames and components are glued synthetic parts. This glue is sensitive to high
temperatures! Therefore you should avoid subjecting your carbon bicycle to high temperatures,
like those that can occur in a car which has been parked in the sun. You should also refrain from
painting or powder coating the carbon parts of your bicycle.
Your specialist retailer will be happy to recommend some suitable products for caring for and
cleaning your carbon parts.
You shouldn’t use any strong chemical cleaning products or products containing solvents as these
could damage the surface of the parts!
However, it is easy to clean everything with a soft cloth, warm water and some household washing
up liquid. Car or spray wax is also well suited to preserving and caring for carbon parts.
Parts subject to wear
There are parts of your bicycle that are subject to wear, depending on their function. You are howe-
ver able to keep this wear to a minimum by increasing the regularity and care with which you clean
and service your bicycle.
Typical parts subject to wear:
The chain •
Rubber grips and bar tape •
The tires •
The chainwheels •
The brake pads •
The surfaces of disc and drum brakes •
Brake and gear cables •
The chainrings •
The seat •
Hydraulic oils and lubricants •
The bulbs of the light system •
The paint •
On top of that, the rims of your bicycle are also subject to wear if you have rim brakes. Regularly
check the rims of your bicycle to see whether the wear markings are still visible or additional marks
have appeared. Even if you can also see small cracks or small deformations to the rims, you should
still have your bicycle checked by a specialist. Even if you can only see fine cracks or the rims are
misshapen, please refrain from riding.
After using two sets of brake pads, you should have the wear on your bicycle rims checked. The
pads of the disk brakes can be subject to high levels of wear, particularly following off-road riding
and sporty use. Check the brake pads before every ride. The thickness of the brake pads may not
be less than 0.5 mm.
Technical information
Permissible total weight:
The total weight is derived from the weight of the rider, the bicycle itself and any possible luggage:
Weight of rider + weight of b weight of luggage = Total weight.
The following weights are permissible:
110 kg for racing bicycles and mountain bicycles
120 kg for trekking, city and touring bicycles
130 kg for expedition bicycles
Admissible load for racks
In the event that nothing to the contrary is stated on the part, then 25 kg is the highest admissible
load for a rear rack, with 10 kg being the highest admissible load for the front rack. Please check if
your manufacturer advises differently!
Torques for bolts and components
Please always adhere to the prescribed torque! Otherwise parts could be damaged and broken!
Screw fittings may only be tightened with the suitable matching torque wrench. If the torque is too