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the joint head must be carefully locked with the lock nut after the adjustment. For larger adjustments,
they distribute the changes in length to both tie rods so that the steering swivel arm is not crooked.
Note: if you notice signs of wear on the front tires after less than 600 km, you should check your wheel
alignment!
5.5 Idlers
The tight strand chain runs under 2 idlers.
In very rare cases, the chain may pop out from under these idlers.
This can be the case with extreme potholes if you pedal at the same time or if the vehicle is lying on
its side and you crank the chain with a relaxed chain.
Driving with a jumped off chain makes loud rattling noises.
In such cases, you should not use force to step on, as this could damage the side windows of the U-
roller.
What to do in such cases?
Slide the chain back under the pulley. It is helpful to push the chain backwards at the same time. A
screwdriver or stick can help. It is advisable to have a pair of disposable gloves in the vehicle for such
cases, otherwise the chain oil will be spread everywhere.
5.6 Flat tires and tire changes
You can change the tires and inner tubes of the wheels without dismantling the wheels because they
are hung on one side. For all work under the vehicle, it is easiest to place the Bülk on the side or rotated
180 degrees on 2 trestles. The bucks should be padded with a soft pad and secured against each other
so that they cannot tip over. The support points should be chosen so that the stiffened parts of the Bülk
are supported so that the body does not buckle.
Remove luggage, seat and battery beforehand.
For safety, it is very important that when mounting the tires and tubes, no part of the tube is pinched
by the casing, that the tube is not installed twisted and that the valve is exactly 90 degrees to the rim.
To be on the safe side, 2 layers of rim tape are always installed in the Bülk, keep this if you change
anything on the wheels. Use talcum powder to keep the hoses supple and slip well into the jacket.
5.7 Correct adjustment of the seat
With its modular concept, the Bülk offers various adjustment options for small to large drivers. A
distinction must be made between basic settings and quick settings. The basic setting should be made
for the main user and always includes the setting of the bottom bracket slide and the chain length. The
quick settings are intended more for friends or family members who want to share the vehicle but are
not the primary user.
5.7.1 Basic settings
Adjust the bottom bracket slide and the seating position so that you sit as far forward in the vehicle as
possible. As a result, they have more stable driving dynamics and make optimal use of the sporty
advantages of the vehicle.
To do this, they sit in the vehicle, loosen the clamp screws of the bottom bracket slide and push the
slide far enough forward that they still have enough space forward with their toes. Lock the sled and
