BMW C400GT - Rider's Manual > Tire recommendation
For every size of tire, BMW Motorrad has tested and approved certain makes as roadworthy. BMW Motorrad cannot evaluate the suitability of other tires, and can therefore take no responsibility for their driving safety.
BMW Motorrad recommends only using the tires tested and approved by BMW Motorrad.
Detailed information can be obtained from your authorized BMW Motorrad retailer or online at: bmw-motorrad.com
Influence of the wheel sizes on the ABS
The wheel sizes play an important role in the ABS system. The diameter and width of the wheels stored in the control unit have particular significance as the basis for all necessary calculations.
A change in these sizes resulting from fitting wheels other than those fitted as standard equipment can seriously affect the control efficiency of this system.
The sensor rings are essential for correct wheel speed detection; they too must match the vehicle's built-in system and consequently are not permitted to be replaced.
If you wish to equip your Scooter with different wheels, please contact a specialist workshop, preferably a BMW Motorrad retailer. In some cases, the data stored in the control unit can be adapted for the new wheel sizes.
Effect of wheel sizes on the ASC
The wheel sizes play an important role in the ASC suspension control system. In particular, the wheel radii are stored in the control unit and used as the basis for all necessary calculations. A change in these sizes resulting from conversion to wheels not installed as standard equipment can seriously affect the control efficiency of these systems.
ATTENTION Faults in the ASC caused by changing tire radii
The ASC grips despite good adhesion
- Check the wear and pressure of both tires.
- Calibrate the ASC after every tire change.
- If there are an unexpectedly large number of ASC interventions: Recalibrate the ASC.
ATTENTION Loss of the adaptation values for the radii of the tires in the Digital Motor Electronics
- Recalibrate the ASC after every software update.
Removing front wheel
- Mask off areas of wheel rim that could be scratched in the process of removing the brake calipers.
- Release the brake line from the holders 1.
ATTENTION Unintentional pressing together of brake pads
Component damage when mounting the brake caliper or when pressing the brake pads apart
- Do not actuate the brakes with the brake caliper removed.
- Remove the screws 2 of brake calipers on left and right.
- Push the brake pads 3 apart slightly by turning the brake caliper 4 against the brake disc 5.
- Carefully pull brake calipers back and outward to remove them from brake rotors.
- Raise the front of the Scooter until the front wheel rotates freely, preferably using a BMW Motorrad front wheel stand.
- Mount front wheel stand.
- Remove screw 1.
- Release the clamping bolt 2.
- Release the clamping bolt 3.
- Press the quick-release axle 4 inward slightly on the left side for a better grip on the right side.
- Remove the quick-release axle 4 while supporting the wheel.
- Roll front wheel forward to remove it.
Installing the front wheel
WARNING Use of a wheel which does not comply with series specifications
Malfunctions during control interventions by ABS and ASC
- Please see the information on the effect of wheel sizes on the ABS and ASC chassis control systems at the beginning of this chapter.
ATTENTION Tightening of screwed connections with incorrect tightening torque
Damage or loosening of screwed connections
- Always have the tightening torques checked by a specialized workshop, preferably an authorized BMW Motorrad retailer.
- If applicable, insert the spacer bushing 5 on the left side in the wheel hub.
ATTENTION Front wheel installation opposite the running direction
- Observe running direction arrows on tire or rim.
- Roll front wheel into front suspension.
- Raise the front wheel and install the quick-release axle 4.
- Mount the screw 1 with the appropriate torque. Brace quick-release axle on the right side at the same time.
- Tighten the clamping bolts 3 and 2 to the appropriate torque.
- Remove front-wheel stand.
- Mount the brake caliper 4 on the brake disc, ensuring that the brake disc 5 is installed between the brake pads 3.
- Install the brake caliper on the other side in the same manner.
- Mount the screws 2 on the left and right until the screw head is in contact, but do not tighten.
- Activate the brake several times until the brake pads are in contact, and secure the brake lever with a rubber band.
- Tighten the screws 2 on the left and right with the appropriate torque.
- Secure the brake line in the holders 1.
- Release the brake lever.
- Retighten the screws 2 on the left and right with the appropriate torque.
- Remove adhesive tape from wheel rim.
Note on removing the rear wheel
Removing the rear wheel requires technical knowledge and special tools. If you are not sure whether this work is within your skill range, please contact a specialist workshop, preferably a BMW Motorrad retailer.
CAUTION Hot engine or hot exhaust system Burn hazard Let the engine and exhaust system cool before beginning work. Place the Scooter on its center stand, ensuring that the ground is level and firm. Remove screw 1. Raise the trim for the silencer 2. Push the trim for the silencer 2 back and remove it. Release the screw 3 of the clamp 4. Remove the screws 5 with washers. Pull the silencer 6 off of the exhaust manifold and remove. Block the rear wheel brake with a rubber band.