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TIRE MAINTENANCE

Ultra High Performance

HIGH PERFORMANCE VS. ULTRA HIGH PERFORMANCE

WHAT`S THE DIFFERENCE BETWEEN HIGH PERFORMANCE
AND ULTRA HIGH PERFORMANCE TIRES

  • high performance tire
  • 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

  • high performance tire
  • 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


ASPECT RATIO

  • ASPECT RATIO
  • 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

  • high performance tire
  • 1P : passenger

    2215 : section width (mm)

    345 : aspect ratio (section height/section width)

    R : radial construction

    517 : rim diameter


SPEED RATING

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

SPEED RATING CHART
Symbol Max Speed (mph & km/h)
Q 99 mph
R 106 mph
S 112 mph
T 118mph
U 124 mph
H 130 mph
V 149 mph
W 168 mph
Y 186 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.