Tire Pressure Monitoring System; Tread; Tread Rib - Volkswagen Golf GTI 2016 Owner's Manual

Tire Pressure Monitoring System
A system that detects when at least one of a
vehicle's tires is underinflated and illuminates a
low tire-pressure warning light.

Tread

The portion of a tire that normally touches the
road.
Tread rib
A tread section running circumferentially around
a tire.