1995 Ferrari 348
tire size detail
Spider
F: 215/50ZR17R: 255/45ZR17
(click for a tire code explanation)
Front Tires
Intended Use Of Tire
P ... 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.
Tire Width
215 millimeters
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 215 indicates that this tire is 215 millimeters across from the widest point when mounted and measured on a specified width wheel. Because many people think of measurements in inches, the 215mm can be converted to inches by dividing the width in millimeters by 25.4 (the number of millimeters per inch).
215mm / 25.4 = 8.46"
Aspect Ratio
50%
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 215mm and that its section height is 50% of 215mm. By converting the 215mm to inches (215 / 25.4 = 8.46") and multiplying it by 50% (.50) we confirm that this tire size results in a tire section height of4.23".
Construction Method
R ... Radial
The R in the 215/50ZR17 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 (215/50ZR17), 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.
Rim Size
17" wheel
The 17 indicates the tire and wheel diameter designed to be matched together.
Tires that have a rim diameter expressed in inches (215/50ZR17, as well as8, 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.
Speed Rating
Z ... over 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 (215/50ZR17) 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.
Rear Tires
Intended Use Of Tire
P ... 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.
Tire Width
255 millimeters
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"
Aspect Ratio
45%
The ratio of the height of the tire's cross-section to it's width. 45 means that the height is equal to 45% 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 45 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 of5.02".
Construction Method
R ... Radial
The R in the 255/45ZR17 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 (255/45ZR17), 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.
Rim Size
17" wheel
The 17 indicates the tire and wheel diameter designed to be matched together.
Tires that have a rim diameter expressed in inches (255/45ZR17, as well as8, 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.
Speed Rating
Z ... over 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 (255/45ZR17) 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.
Ferrari N.V. is an Italian sports car manufacturer based in Maranello. Founded by Enzo Ferrari in 1939 out of Alfa Romeo's race division as Auto Avio Costruzioni, the company built its first car in 1940. However the company's inception as an auto manufacturer is usually recognized in 1947, when the first Ferrari-badged car was completed.
In 2014, Ferrari was rated the world's most powerful brand by Brand Finance.[3] In May 2012 the 1962 Ferrari 250 GTO became the most expensive car in history, selling in a private transaction for US$38.1 million to American communications magnate Craig McCaw.[4]
Fiat S.p.A. acquired 50 percent of Ferrari in 1969 and expanded its stake to 90 percent in 1988.[5] In October 2014 Fiat Chrysler Automobiles announced its intentions to separate Ferrari S.p.A. from FCA; as of the announcement FCA owned 90 percent of Ferrari.[6][7][8] The separation began in October 2015 with a restructuring that established Ferrari N.V. (a company incorporated in the Netherlands) as the new holding company of the Ferrari group and the subsequent sale by FCA of 10 percent of the shares in an IPO and concurrent listing of common shares on the New York Stock Exchange.[9] Through the remaining steps of the separation, FCA's interest in Ferrari's business was distributed to shareholders of FCA, with 10 percent continuing to be owned by Piero Ferrari.[10] The spin-off was completed on 3 January 2016.[9]
Throughout its history, the company has been noted for its continued participation in racing, especially in Formula One, where it is the most successful racing team, holding the most constructors championships (16) and having produced the highest number of winning drivers (15).[11] Ferrari road cars are generally seen as a symbol of speed, luxury and wealth.