User Guide

Document Control No. C90.CD.QA.018.H
Effective 6-December-2021
The information provided above is an overview of tire types. Tread patterns and rubber
compounds vary among the seasonal tire types and provide varying performance characteristics
and limitations. Summer performance tires are different than winter and All Season types.
3. Pressure Recommendations
Recommended tire inflation pressures for your vehicle can be found either on your vehicle’s tire
placard or in your owner’s manual. Correct pressures are related to load, speed and vehicle
handling and are vital for even braking, maximum traction and good tire life. Under no
circumstances should your tires’ cold inflation pressure be less than that indicated on your
vehicle’s tire placard or in your owner’s manual or higher than the maximum cold inflation
pressure molded on to the tire’s sidewall. Under inflation causes excessive flexing, deterioration
of the tire and rapid wear of the tread edges. Over inflation results in an uncomfortable ride, a
reduced area of tire contact with the road surface (i.e., smaller tire footprint), higher
susceptibility to impact damage and rapid wear on the tread center.
Whether inflated by air or nitrogen, regular inflation pressure maintenance remains critical and
necessary. Use of nitrogen alone is not a replacement for regular inflation pressure
maintenance.
WARNING: Driving on tires with improper inflation pressure is dangerous. These
situations can cause a tire failure, including tread/belt separation, even at a later date,
which could lead to an accident and serious personal injury or death.
Inflation pressure must be checked at least once a month and before long trips, and should be
checked only when the tire is cold or before it has been driven. Driving even a short distance
causes tires to heat up and the air pressure to increase. Never reduce or “bleed” air from hot
tires since your tires will then be underinflated when they cool down. Always use a reliable
pressure gauge.
4. UHP Summer Tires
The special tread compounds formulated for Ultra High Performance (UHP) summer tires are
optimized for maximum dry and wet performance in warm temperatures. The compounds in
these tires will have decreased performance, such as lateral and braking traction, at
temperatures below 45° F (7°C) or when driving on snow or ice. In addition, they can lose
flexibility and may develop random surface cracks at very cold temperatures; therefore extra
care should be used in handling tires. All Season or winter tires should be installed for use at
temperatures below 45° F (7°C), UHP summer tires are not recommended for lower
temperature conditions.
5. DOT Street Legal Competition Tires
P Zero Trofeo, P Zero Trofeo R, P Zero Corsa and P Zero Corsa System tire lines use special
tire construction and compounds to achieve their distinctive performance in dry conditions. As a
result of that, their performance in cold temperatures, heavy rain or standing water will be
decreased. Use extreme caution and drive slowly on wet roads. Additionally, the minimum tread
depth will be reached earlier than with standard road tires, resulting in reduced tread life.
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