
 
  Install summer tires promptly in the spring. Summer tires offer 
better handling characteristics for temperatures above +45 °F (+7 °C). 
They are quieter, do not wear as quickly, and reduce fuel consump-
tion. 
  If factory-installed wheels and/or tires are replaced when in-
stalling winter tires, make sure that the wheels are equipped with 
sensors that are compatible with the factory-installed Tire Pressure 
Monitoring System and that the tires are also compatible with the sys-
tem. If new tires are not identical to those that were removed and re-
quire different cold tire inflation pressure, the tire inflation pressure 
values must be reprogrammed for the TPMS. Please see your author-
ized Volkswagen dealer or authorized Volkswagen Service Facility ⇒  
The Tire Pressure Monitoring System must be recalibrated whenever 
you remove and remount or change any wheel or tire on the vehicle, 
even if the reinstalled or replacement wheels and tires are identical to 
those that were removed and even if the tire pressure does not 
change. 
  If necessary, ask your authorized Volkswagen dealer or author-
ized Volkswagen Service Facility about permissible winter tire dimen-
sions. 
Snow chains 
 

 
Remove center hubcaps and decorative rim rings before installing 
snow chains ⇒ . However, for safety reasons, caps must be in-
stalled on the wheel bolts. These are available from authorized 
Volkswagen dealers and authorized Volkswagen Service Facilities. 
Compact spare wheel 
For technical reasons, snow chains cannot be used on the compact 
spare 
If you must use snow chains and have a compact spare wheel 
mounted, move the compact spare wheel to the rear axle if a front tire 
has to be replaced. The tire taken off the rear axle can then be used 
to replace the flat front tire. Be sure to install the unidirectional tires so 
that they will run in the proper direction. Volkswagen recommends 
installing the snow chains before mounting the wheel to the vehicle. 
  WARNING 
Using the wrong snow chains or installing snow chains im-
properly can cause accidents and severe personal injuries. 
  Always use the proper snow chains. 
  Follow the installation instructions provided by the snow 
chain manufacturer. 
  Never exceed the permissible speed limit when driving with 
snow chains.  
  NOTICE 
  Remove snow chains when roads are free of snow. Otherwise, 
the chains can damage the tires, impair vehicle handling and can 
be quickly worn down. 
  Snow chains can scratch or damage wheel rims if they have 
direct contact with the rims. Volkswagen recommends using 
coated snow chains. 
Glossary of tire and loading terminology 
 

 
Accessory weight 
The combined weight (in excess of those standard items which may 
be replaced) of automatic transmission, electro-mechanical power 
steering, power brakes, power windows, power seats, radio, and 
heater, to the extent that these items are available as factory-installed 
equipment (whether installed or not). 
Aspect ratio 
The ratio of sidewall height to tire width, expressed as a percentage. 
A number of 70 (0.7:1 or 70%) or lower indicates a low-profile tire with 
a shorter sidewall for improved steering response and better overall 
handling on dry pavement. 
Bead 
The part of a tire made of steel wires, wrapped or reinforced by ply 
cords, with the shape and structure to ensure proper fit to the wheel 
rim. 
Bead separation 
A breakdown of the bond between components in the bead. 
Carcass 
The tire structure, except tread and sidewall rubber which, when in-
flated, bears the load. 
Chunking 
The breaking away of pieces of the tread or sidewall. 
Cord 
The strands of material forming the plies in the tire. 
Cord separation 
The parting of cords from adjacent rubber compounds. 
Cracking 
Any parting within the tread, sidewall, or inner liner of the tire extend-
ing to cord material. 
Cold tire inflation pressure 
The tire pressure recommended by the vehicle manufacturer for a tire 
of a specified size that has not been driven for more than a couple of  

 
miles (kilometers) at low speeds in the 3 hour period before the tire 
pressure is measured or adjusted. 
Curb weight 
The weight of a motor vehicle with standard equipment including the 
maximum capacity of fuel, oil, and coolant, air conditioner, and addi-
tional weight of optional equipment. 
Extra load tire 
A tire designed to operate at higher loads and at higher inflation pres-
sures than the corresponding standard tire. 
Gross Axle Weight Rating (GAWR) 
The load-carrying capacity of a single axle system, measured where 
the tire contacts the ground. 
Gross Vehicle Weight Rating (GVWR) 
The maximum loaded weight of the vehicle. 
Groove 
The space between 2 adjacent tread ribs. 
Load rating (code) 
The maximum load that a tire is rated to carry for a given inflation 
pressure. You may not find this information on all tires because it is 
not required by law. 
Maximum load rating 
The load rating for a tire at the maximum permissible inflation pres-
sure for that tire. 
Maximum loaded vehicle weight 
The total of: 
  Curb weight. 
  Accessory weight. 
  Vehicle capacity weight. 
  Production options weight. 
Maximum (permissible) inflation pressure 
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 
The placement of passengers in a vehicle. 
Outer diameter 
The diameter of a new, properly inflated tire. 
Overall width 
Total width measured at the exterior sidewalls of an inflated tire, in-
cluding the additional width of labeling, decorations, or protective 
bands or ribs. 
Passenger car tire 
A tire intended for use on passenger cars, multipurpose passenger 
vehicles, and trucks, that have a gross vehicle weight rating (GVWR) 
of 10,000 pounds or less. 
Ply 
A layer of rubber-coated parallel cords. 
Ply separation 
A parting of rubber compound between adjacent plies. 
Pneumatic tire 
A mechanical device made of rubber, chemicals, fabric, and steel or 
other materials, that, when mounted on an automotive wheel, pro-
vides the traction and contains the gas or fluid that sustains the load. 
Production options weight 
The combined weight of installed regular production options weighing 
over 5 lbs (2.3 kg) more than the standard items they replace, and not 
previously considered as curb weight or accessory weight. These 
include, for example, heavy-duty brakes, ride levelers, roof rack, 
heavy-duty battery, and special trim. 
Radial ply tires 
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 
The tire pressure recommended by the vehicle manufacturer for a tire 
of a specified size that has not been driven for more than a couple of 
miles (kilometers) at low speeds in the 3 hour period before the tire 
pressure is measured or adjusted. 
Reinforced tire 
A tire designed to operate at higher loads and at higher inflation pres-
sures than the corresponding standard tire. 
Rim 
The outer edge of a wheel upon which the tire beads are seated. 
Rim diameter 
The nominal diameter of the wheel's tire bead seating surface. If you 
change your wheel size, to wheels of a different diameter, you will 
have to purchase new tires to match the new wheels. 
Rim size 
Designation means rim diameter and width. 
Rim type designation 
The industry or manufacturer's designation for a rim by style or code. 
Rim width 
The nominal distance between wheel rim flanges. 
Section width 
The linear distance between the exteriors of the sidewalls of an inflat-
ed tire, excluding elevations due to labeling decoration, or protective 
bands. 
Sidewall 
The portion of a tire between the bead and the tread. 
Sidewall separation 
The parting of the rubber compound from the cord material in the 
sidewall.  

 
Speed rating (letter code) 
A standardized letter code indicating the maximum speed at which a 
tire is designed to be driven for extended periods of time. The ratings 
range from 93 mph or 150 km/h (“P”) to 186 mph or (300 km/h) “Y”. 
The speed rating letter code, where applicable, is molded on the tire 
sidewall. You may not find this information on all tires because it is 
not required by law. 
Tire Pressure Monitoring System 
A system that detects when at least one of a vehicle's tires is underin-
flated 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. 
Tread separation 
Tire failure caused by the tread pulling away from the tire carcass. 
Tread wear indicators (TWI) 
Raised areas within the main tread grooves that show, visually, when 
tires are worn and near the end of their useful life ⇒ page 261. 
Uniform Tire Quality Grading (UTQG) 
A tire information system developed by the U.S. National Highway 
Traffic Safety Administration (NHTSA) that is designed to help buyers 
compare tires. UTQG is not a safety rating, nor is it a guarantee that a 
tire will last for a certain number of miles or perform a certain way. It 
gives tire buyers more information to compare with factors such as 
price, brand loyalty and dealer recommendations. Under UTQG, tires 
are graded by the tire manufacturers in 3 areas: tread wear, traction 
and temperature resistance. UTQG information is molded into the tire 
sidewalls. 
U.S. DOT Tire Identification Number (TIN) 
A tire's serial number. It begins with the letters “DOT” (“Department of 
Transportation”) and indicates that the tire meets all federal stand-
ards. The next 2 numbers or letters indicate the plant where the tire