#### 4.2i, 5.3i

###### P255/55R18 104H

(click for a tire code explanation)

#### P

###### Intended Use Of Tire

Passenger Vehicle. When a tire size begins with a P, it signifies the tire is a p-metric size that was designed to be fitted on vehicles that are primarily used as passenger vehicles. This includes cars, minivans, sport utility vehicles and light duty pickup trucks (typically 1/4- and 1/2-ton load capacity). The use of p-metric sizes began in the late 1970s and they are the most frequently used type of tire size today.

#### 255 millimeters wide

###### Tire Width

Following the letter(s) that identify the type of vehicle and/or type of service for which the tire was designed, the three-digit numeric portion identifies the tire's section width/cross section in millimeters.

The 255 indicates that this tire is 255 millimeters across from the widest point when mounted and measured on a specified width wheel. Because many people think of measurements in inches, the 255mm can be converted to inches by dividing the width in millimeters by 25.4 (the number of millimeters per inch).

255mm / 25.4 = 10.04"

#### 55%

###### Aspect Ratio

The ratio of the height of the tire's cross-section to it's width. 55 means that the height is equal to 55% of the tire's width.

Typically, following the three digits identifying the tire's width in millimeters is a two-digit number that identifies the tire's profile or aspect ratio.

The 55 indicates that this tire size's sidewall height (from rim to tread) is 50% of its width. The measurement is the tire's section height, and also referred to as the tire's series, profile or aspect ratio. The higher the number, the taller the sidewall. The lower the number, the lower the sidewall. We know that this tire size's section width is 255mm and that its section height is 50% of 255mm. By converting the 255mm to inches (255 / 25.4 = 10.04") and multiplying it by 50% (.50) we confirm that this tire size results in a tire section height of 5.02".

#### R

###### Construction Method

Radial. The R in the P255/55R18 104H size identifies that the tire has a radial construction in which the tire's plies "radiate" out from the center of the wheel. Radial tires are by far the most popular type of tire today representing over 98% of all tires sold.

If the R in the size was replaced with a D (P255/55R18 104H), it would identify that the internal tire body plies crisscross on a diagonal and that the tire has a "bias ply" construction. Tires using this construction are for light truck and spare tire applications.

#### 18" wheel

###### Rim Size

The 18 indicates the tire and wheel diameter designed to be matched together.

Tires that have a rim diameter expressed in inches (P255/55R18 104H, as well as 8, 10, 12, 13, 14,15, 17, 18, 19, 20, 22, 23, 24, 26 and 28) are called "inch rim" sizes. These are the most common types of tire sizes and are used on most cars, minivans, vans, sport utility vehicles and light duty light trucks.

Tires and wheels with unique rim diameters should never be combined with traditional "inch rim" tires and wheels.

#### 104

2100lb load. The tire assigned numerical value used to compare relative load carrying capabilities.

The 104 represents the tire's service description. A service description identifies the tire's load index and speed rating. Service descriptions are required on all speed rated (except for Z-speed rated) tires manufactured since the early 1990s.

#### H

###### Speed Rating

210mph. The maximum speed that the tire can sustain for 10 minutes.

Today, the only tires that continue to include the speed rating "in" the tire size (P255/55R18 104H) are Z-speed rated tires. In this case, following the two digits used to identify the aspect ratio are the letters ZR to identify the tire's speed rating (Z) and its internal construction (R). Since 1991, all other speed ratings are identified in the tire's Service Description.

#### Aero

###### P255/50R20 104V

(click for a tire code explanation)

#### P

###### Intended Use Of Tire

Passenger Vehicle. When a tire size begins with a P, it signifies the tire is a p-metric size that was designed to be fitted on vehicles that are primarily used as passenger vehicles. This includes cars, minivans, sport utility vehicles and light duty pickup trucks (typically 1/4- and 1/2-ton load capacity). The use of p-metric sizes began in the late 1970s and they are the most frequently used type of tire size today.

#### 255 millimeters wide

###### Tire Width

Following the letter(s) that identify the type of vehicle and/or type of service for which the tire was designed, the three-digit numeric portion identifies the tire's section width/cross section in millimeters.

The 255 indicates that this tire is 255 millimeters across from the widest point when mounted and measured on a specified width wheel. Because many people think of measurements in inches, the 255mm can be converted to inches by dividing the width in millimeters by 25.4 (the number of millimeters per inch).

255mm / 25.4 = 10.04"

#### 50%

###### Aspect Ratio

The ratio of the height of the tire's cross-section to it's width. 50 means that the height is equal to 50% of the tire's width.

Typically, following the three digits identifying the tire's width in millimeters is a two-digit number that identifies the tire's profile or aspect ratio.

The 50 indicates that this tire size's sidewall height (from rim to tread) is 50% of its width. The measurement is the tire's section height, and also referred to as the tire's series, profile or aspect ratio. The higher the number, the taller the sidewall. The lower the number, the lower the sidewall. We know that this tire size's section width is 255mm and that its section height is 50% of 255mm. By converting the 255mm to inches (255 / 25.4 = 10.04") and multiplying it by 50% (.50) we confirm that this tire size results in a tire section height of 5.02".

#### R

###### Construction Method

Radial. The R in the P255/50R20 104V size identifies that the tire has a radial construction in which the tire's plies "radiate" out from the center of the wheel. Radial tires are by far the most popular type of tire today representing over 98% of all tires sold.

If the R in the size was replaced with a D (P255/50R20 104V), it would identify that the internal tire body plies crisscross on a diagonal and that the tire has a "bias ply" construction. Tires using this construction are for light truck and spare tire applications.

#### 20" wheel

###### Rim Size

The 20 indicates the tire and wheel diameter designed to be matched together.

Tires that have a rim diameter expressed in inches (P255/50R20 104V, as well as 8, 10, 12, 13, 14,15, 17, 18, 19, 20, 22, 23, 24, 26 and 28) are called "inch rim" sizes. These are the most common types of tire sizes and are used on most cars, minivans, vans, sport utility vehicles and light duty light trucks.

Tires and wheels with unique rim diameters should never be combined with traditional "inch rim" tires and wheels.

#### 104

2100lb load. The tire assigned numerical value used to compare relative load carrying capabilities.

The 104 represents the tire's service description. A service description identifies the tire's load index and speed rating. Service descriptions are required on all speed rated (except for Z-speed rated) tires manufactured since the early 1990s.

#### V

###### Speed Rating

240mph. The maximum speed that the tire can sustain for 10 minutes.

Today, the only tires that continue to include the speed rating "in" the tire size (P255/50R20 104V) are Z-speed rated tires. In this case, following the two digits used to identify the aspect ratio are the letters ZR to identify the tire's speed rating (Z) and its internal construction (R). Since 1991, all other speed ratings are identified in the tire's Service Description.

Saab Automobile AB was a manufacturer of automobiles that was founded in Sweden in 1945 when its parent company, SAAB AB (soon to be Saab AB), began a project to design a small automobile. The first production model, the Saab 92, was launched in 1949. In 1968 the parent company merged with Scania-Vabis, and ten years later the Saab 900 was launched, in time becoming Saab's best-selling model. In the mid-1980s the new Saab 9000 model also appeared.

In 1989, the automobile division of Saab-Scania was restructured into an independent company, Saab Automobile AB. The American manufacturer General Motors (GM) took 50 percent ownership with an investment of US\$600 million. Two well-known models to come out of this period were the Saab 9-3 and the Saab 9-5. Then in 2000, GM exercised its option to acquire the remaining 50 percent for a further US\$125 million; so turning Saab Automobile into a wholly owned GM subsidiary. In 2010 GM sold Saab Automobile AB to the Dutch automobile manufacturer Spyker Cars N.V.[3]

After struggling to avoid insolvency throughout 2011, the company petitioned for bankruptcy following the failure of a Chinese consortium to complete a purchase of the company; the purchase had been blocked by the former owner GM, which opposed the transfer of technology and production rights to a Chinese company.[4] On 13 June 2012, it was announced that a newly formed company called National Electric Vehicle Sweden (NEVS) had bought Saab Automobile's bankrupt estate.[5] According to "Saab United", the first NEVS Saab 9-3 drove off its pre-production line on 19 September 2013.[6] Full production restarted on 2 December 2013,[7] initially the same gasoline-powered 9-3 Aero sedans that were built before Saab went bankrupt, and intended to get the automakerâ€™s supply chain reestablished as it attempted development of a new line of NEVS-Saab products.[8][9] NEVS lost its license to manufacture automobiles under the Saab name in the summer of 2014 and now plans to produce electric cars based on the 9-3 under its own brand name. Wikipedia