Mercedes-Benz SLR-Class 2007 - Manual (Page 261)

260
Operation
Tires and wheels
Life of tire
The service life of a tire is dependent upon
varying factors including but not limited to:
ț Driving style
ț Tire inflation pressure
ț Distance driven
Tread depth
Do not allow your tires to wear down too
far. Adhesion properties on wet roads are
sharply reduced at tread depths of less
than
1 /
8
in (3 mm).
Treadwear indicators (TWI) are required by
law. These indicators are located in six
places on the tread circumference and
become visible at a tread depth of
approximately 1 /
16
in (1.6 mm), at which
point the tire is considered worn and
should be replaced.
Recommended minimum tire tread depth:
ț Summer tires 1 /
8
in (3 mm)
ț Winter tires 1 /
6
in (4 mm)
1 TWI (Tread Wear Indicator)
The treadwear indicator appears as a solid
band across the tread.
Warning!
G
Tires should be replaced after 6 years,
regardless of the remaining tread.
Warning!
G
Although the applicable federal motor safety
laws consider a tire to be worn when the
treadwear indicators (TWI) become visible at
approximately 1 /
16
in (1.6 mm), we recom-
mend that you do not allow your tires to
wear down to that level. As tread depth
approaches 1 /
8
in (3 mm), the adhesion
properties on a wet road are sharply
reduced.
Depending upon the weather and/or road
surface (conditions), the tire traction varies
widely.