Volvo XC90: Wheels and tires / Tread wear indicator
The tread wear indicator shows the status of the tire's tread.

The tread wear indicator is a narrow elevated strip running across the tire's
longitudinal tread grooves. The letters TWI (Tread Wear Indicator) are visible on
the side of the tire. When approximately 1.6 mm (1/16 inch) is left on the tread,
the tread will be at the same height as the tread wear indicator. Replace the tire
as soon as possible. Tires with low tread offer very poor traction in rain or snow.
Tires with tread designed to roll in only one direction are marked with an
arrow on the sidewall.
The arrow shows the tire's direction of rotation.
The tire should maintain the same direction of rotation throughout its service
life...
The following is a glossary of tire-related terms.
The tire suppliers may have additional markings, notes or warnings such as standard
load, radial tubeless, etc...
Other information:
The apps and buttons for vehicle functions can be moved and organized in the
App and Function views.
Swipe from right to left1
to access App view or swipe from left to right1
to access Function view.
Press and hold an app or button.
The app or button will change size and become slightly transparent...
As a supplement to the seat belts, the vehicle is equipped with driver and
passenger side front airbags.
Driver/passenger side front airbags.
In a frontal collision, the airbags help protect the driver's and passenger's
head, neck, face and chest and the driver's knees and legs...