Tire tread
Summer tires
Do not drive with a tire tread depth of less than 0.12 in/3 mm.
There is an increased danger of hydroplaning if the tread depth is less than 0.12 in/3 mm.
Winter tires
Do not drive with a tire tread depth of less than 0.16 in/4 mm.
Below a tread depth of 0.16 in/4 mm, tires are less suitable for winter operation.
Minimum tread depth

Wear indicators are distributed around the tire's circumference and have the legally required minimum height of 0.063 in/1.6 mm.
They are marked on the side of the tire with TWI, Tread Wear Indicator.
See also:
Opening
Front
Front
To open the cover, slide it forward
Rear
BMW X6
BMW X6
Slide the cover back.
Emptying
Take out the insert. ...
Instrument cluster
1.Speedometer 135i: with fuel gauge
2. Indicator lamps for turn signals
3. Indicator and warning lamps
4. Tachometer
5. Fuel gauge 135i: engine oil temperature
6. ...
Lug bolt lock
The lug bolt lock is in the tool kit or in a storage
compartment close to the tool kit.
▷ Lug bolt, arrow 1.
▷ Adapter, arrow 2.
Removing
1. Attach the adapter to the wheel lug.
...
