Audi TT 2010 Owner's Manual page 224

- Tires and wheels
pn, __________________ _
Groove
means the space between two adjacent tread ribs.
Load rating (code)
means the maximum load that a tire is rated to carry for a g iven infla-
tion pressure. You may not find this information on all tires because
it is not required by law.
Maximum load rating
means the load rating fo r a t ire at the maximum permissible inflation
pressure for that tire.
Maximum loaded vehicle weight
means the sum of:
(a) Curb weight
(b) Accessory weight
(c) Vehicle capacity weight, and
(d) Production options weight
Maximum (permissible) inflation pressure
means the maximum cold inflation pressure to which a tire may be
inflated. Also called "maximum inflation pressure."
Normal occupant weight
means 150 lbs. (68 kilograms) times the number of occupants seated
in the vehicle up to the total seating capacity of your vehicle.
Occupant distribution
means distr ibuti on of occupants in a vehicle .
Outer diameter
means t he overall diameter of an inflated new tire.
Overall width
means the linear distance between the exteriors of the sidewalls of
an inflated tire, including elevations due to labeling, decorations, or
protective bands or ribs .
Ply
means a layer of rubber -coated paralle l cords.
Production options weight
means the combined weight of those install ed regular production
options weigh ing over 5 lbs. (2.3 kg) in excess of those standard
items which they replace, not previously considered in curb weight or
accessory weight, including heavy duty brakes, ride levelers, roof
rack, heavy duty battery, and special trim.
Radial ply tire
means a pneumatic tire in which the ply cords that extend to the
beads are laid at substantially 90 degrees to the centerline of the
tread .
Recommended inflation pressure
see => page 221, "Cold tire inflation pressure".
Reinforced tire
means a tire designed to operate at higher loads and at higher infla-
tion pressures than the corresponding standard tire. Reinforced tires
my be identified as "XL", "xl", "EXTRA LOAD", or "RF" on the sidewall.
Rim
means a metal suppo rt fo r a tire or a tire and tube assembly upon
wh ich the tire beads are seated .
Rim diameter
means nominal diameter of the bead seat . If you change your wheel
size, you w ill have to purchase new tires to match the new rim diam-
eter .
Rim size designation
means rim diameter and width.
Rim width
means nominal distance between rim flanges.