2014 SRT Viper
tire size detail
Base, GTS, TA
F: P295/30ZR18 (94Y)R: P355/30ZR19/LL (99Y)
(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
295 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 295 indicates that this tire is 295 millimeters across from the widest point when mounted and measured on a specified width wheel. Because many people think of measurements in inches, the 295mm can be converted to inches by dividing the width in millimeters by 25.4 (the number of millimeters per inch).
295mm / 25.4 = 11.61"
Aspect Ratio
30%
The ratio of the height of the tire's cross-section to it's width. 30 means that the height is equal to 30% 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 30 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 295mm and that its section height is 50% of 295mm. By converting the 295mm to inches (295 / 25.4 = 11.61") and multiplying it by 50% (.50) we confirm that this tire size results in a tire section height of5.80".
Construction Method
R ... Radial
The R in the P295/30ZR18 (94Y) 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 (P295/30ZR18 (94Y)), 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
18" wheel
The 18 indicates the tire and wheel diameter designed to be matched together.
Tires that have a rim diameter expressed in inches (P295/30ZR18 (94Y), 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 (P295/30ZR18 (94Y)) 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
355 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 355 indicates that this tire is 355 millimeters across from the widest point when mounted and measured on a specified width wheel. Because many people think of measurements in inches, the 355mm can be converted to inches by dividing the width in millimeters by 25.4 (the number of millimeters per inch).
355mm / 25.4 = 13.98"
Aspect Ratio
30%
The ratio of the height of the tire's cross-section to it's width. 30 means that the height is equal to 30% 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 30 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 355mm and that its section height is 50% of 355mm. By converting the 355mm to inches (355 / 25.4 = 13.98") and multiplying it by 50% (.50) we confirm that this tire size results in a tire section height of6.99".
Construction Method
R ... Radial
The R in the P355/30ZR19/LL (99Y) 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 (P355/30ZR19/LL (99Y)), 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
19" wheel
The 19 indicates the tire and wheel diameter designed to be matched together.
Tires that have a rim diameter expressed in inches (P355/30ZR19/LL (99Y), 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.
Load Range/Ply Rating
LL
This tire has a ply rating of which indicates how much load the tire is designed to carry at it's specified pressure.
Load Index/Service Description
( ... NaNlb load
The tire assigned numerical value used to compare relative load carrying capabilities.
The ( 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.
Speed Rating
99 ... mph
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 (P355/30ZR19/LL (99Y)) 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.
Street & Racing Technology (commonly called SRT) is a high-performance automobile group within Fiat Chrysler Automobiles. SRT began as "Team Viper" to develop the Dodge Viper. It later merged with "Team Prowler", the developers of the Plymouth Prowler, to become Specialty Vehicle Engineering (SVE). This was renamed Performance Vehicle Operations (PVO). Since all PVO vehicles used the SRT name, the PVO development group was renamed SRT in 2004. SRT heavily tunes and produces vehicles for the Chrysler, Dodge, and Jeep brands.
The naming convention used by SRT for its models are indicative of the vehicle's engine type. The number that follows the "SRT" prefix denotes the number of engine cylinders the vehicle has. For example: the Chrysler 300C SRT8 has a 6.1 liter Hemi V-8; Therefore, the SRT version is known as the Chrysler 300C SRT-8. Similarly, the Dodge Viper SRT-10 along with the Dodge Ram SRT-10 had an 8.3 L V-10.
Currently the fastest SRT production models are the 2018 Challenger Demon with a quarter mile time of 9.65 seconds, the 2015 Charger Hellcat with a quarter mile time of 11.0 seconds, the 2013 Dodge Viper SRT with a quarter mile time of 11.1 seconds, and the 2015 Challenger Hellcat with quarter mile time of 11.2 seconds. Other SRT models have recorded quarter mile performances, from 12.8 seconds[1] for the AMG-based Chrysler Crossfire SRT-6 to the Dodge Neon SRT-4 at 13.9 seconds.
Chrysler released the 6.4L Hemi engine in early 2011. New SRT-8 versions have 392 HEMI (6.4L) engine, rated at 470 hp (350 kW) and 470 lb·ft (637 N·m).[2]
The new engine is used in the 2012 Dodge Challenger SRT8, Dodge Charger SRT8, Chrysler 300 SRT8 and the Jeep Grand Cherokee SRT8. With the improved engine, current SRT8 model are not only faster than the previous model, but also has better fuel efficiency than the previous one.
In 2012 Chrysler implemented a plan to turn SRT into a separate brand under the Chrysler Group umbrella.[4] During the 2013 and 2014 model years, the Dodge Viper was sold under the model name SRT Viper. In May 2014, the SRT brand was re-consolidated under Dodge, with former SRT CEO Ralph Gilles continuing as senior vice president of product design and also as the CEO and president of Motorsports.[5]
In late 2014, Chrysler announced a new variant of the SRT named "SRT Hellcat" and another variant called the "SRT Demon" in early 2017.