Tread Depth; Wheel Rims - Hobby optima Manual

04-3
Wheels and tyres
If the pressure is too low, this may cause overheating of
the tyre, possibly resulting in severe damage to the tyre.
For the correct inflation pressure, please refer to the table in
the chapter on "Technical Data" or the operating instructions
for the basic vehicle.

4.4 Tread depth

Replace your tyres as soon as the tread depth is only 1.6 mm.
The minimum tread depth gives you only the barest amount of
safety while driving. The following recommendations must be
observed:
Safety limit in summer: 3.0 mm
Safety limit in winter: 4.0 mm
Tyres may not be exchanged crosswise, i.e. from the right side
of the vehicle to the left and vice versa.
Tyres age even if they are used seldom or not at all.
Tyre manufacturers' recommendations
• Irrespective of their tread depth, tyres should be changed
every 6 years.
• Avoid hard impacts against curbs, potholes or other
obstacles.

4.5 Wheel rims

Only use the rims noted in the registration documents.
Should you wish to use other rims, please note the following.
The following applies when using other wheel rims:
- Size,
- construction,
- injection depth and
- The load bearing capacity must be sufficient for the per-
missible total axle weight.
- The cone of the fastening screw must correspond to the
construction of the wheel rim.
Adaptations are only permitted if these have been released by
the manufacturer.
Aluminium wheel rims must be tested separately for each type
of vehicle. The screws used on aluminium rims may not be
used for steel rims.