Ultra High Performance
HIGH PERFORMANCE VS. ULTRA HIGH PERFORMANCE
WHAT`S THE DIFFERENCE BETWEEN HIGH PERFORMANCE
AND ULTRA HIGH PERFORMANCE TIRES
HIGH PERFORMANCE TIRE CHARACTERISTICS ...
Typically have aspect ratios of 60
Have an H speed rating
Provide improved traction and handling as compared to non-performance tires
Often provide all-season capabilities but some are not built for snow and ice
Are generally less expensive than Ultra High Performance products
ULTRA HIGH PERFORMANCE TIRE CHARACTERISTICS ...
Typically have aspect ratios of 55 or lower
Have speed ratings of V or above
Typically are designed for rim diameters of 16" and above
Provide excellent traction, cornering and overall handling
Have stiffer sidewalls to maximize contact with the road during cornering
Not designed for snow and ice although there are exceptions
The aspect ratio is the section height of the tire divided by its section width
Low aspect ratio tires are wider and have shorter, stiffer sidewalls
Low aspect ratios deliver enhanced performance attributes such as hard cornering and improved handling
Low aspect ratio tires also impart a sporty, modern look
1P : passenger
2215 : section width (mm)
345 : aspect ratio (section height/section width)
4 R : radial construction
517 : rim diameter
A tire with the proper speed rating is important for a vehicle`s overall performance capability
When replacing a tire, always match or exceed the speed rating of the vehicle`s original equipment to preserve the performance capabilities of your vehicle.
A speed rating indicates the maximum speed at which a tire can perform based on controlled tests - but it does not sanction operating speeds beyond what`s permissible by law.
A speed rating is identified within an alphanumeric "service description" code.
Example of Service Description (load index + speed rating) 99H
99 : load index, equating to a max load carrying capacity of 1,709 lbs.
H : speed rating, indicating a maximum safe speed of 130 mph
WHAT ABOUT Z-SPEED RATED TIRES?
Z-speed rated tires originally reflected the hightest speed rating. When new cars were developed that could exceed this speed, the automotive industry added the W and Y rating. While a Z-rating still often appears, such as : 215/50ZR16 91W ... the Z in the size signifies a maximum speed capability in excess of 149 mph; the W in the service description indicates the tire’s 168 mph maximum speed. When the Y-rating in a service description is enclosed in parentheses such as 285/35ZR19 (99Y), the top speed of the tire has been tested in excess of 186 mph.