Audi R8 2017 Owner's Manual page 253

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expressed in percen t age. Conventional ti res have
a height/w idt h rat io of 60 or more .
The performan ce of low-aspect-ratio tires is par-
ticularly sensitive to improper inflation pres-
sure. It is therefore important that low aspect
ratio tires are inflated to the specified pressure
and that the inflation pressure is regularly
checked and maintained . Tire pressures should
be checked at least once a month and always
before a long trip c>page 245.
What you can do to avoid tire and rim
damage
Low aspect rat io tires can be damaged more easi -
ly by impact with potho les, cu rbs, gullies or
ridges on the road, pa rt icula rly if the ti re is un-
de rinflated.
In o rder to minimize t he occurrence of impact
damage to the t ires of your ve hicle , we recom-
mend that you observe t he fo llow ing precau-
tions:
- Always mai nta in recommended inflation pres-
s ur es. Check your tire pressure every 2,000
miles (3,000 km) and add a ir if necessa ry.
- Drive caref ully on roads with potho les , deep
gull ies or ridges . The impact from drivi ng
t hr ough or ove r such obstacles can damage
yo ur ti res . I mpa ct w ith a cur b may also cause
dam age to yo ur tir es .
- Aft er any im pact, immediately insp ect your
t ires o r have t hem inspec t ed by t he ne ar est au-
t horized Aud i de al e r. Repla ce a da maged t ire as
soon as poss ible.
- Inspe ct yo ur t ires every 2,00 0 miles (3,00 0 km )
for da mage a nd we ar . Dam age is no t always
easy to see . Damage can lea d to loss of air and
under inflation, which cou ld eventually ca use
t ire failure . If you believe that a tire may have
been damaged, rep lace the t ire as soon as pos-
s ible.
- These tires may wear more qu ickly t han othe rs .
- Please a lso remember t hat, w hile these tires
deliver responsive handling , they may ride less
com fortab ly and ma ke more no ise than ot her
cho ices.
Wheels
Reduced performance in winter/cold season
conditions
All tires are des igned for certain purposes . The
low aspect ratio , ultra high performance tires
origina lly installed on your vehicle are intended
fo r maximum d ry and wet road perfo rmance and
handli ng. They a re not suitable for co ld, snowy or
icy wea t her cond it ions. If yo u driv e under t hos e
circums t ances, you should equip yo ur vehicle
wit h all-se ason or winter t ires, which offer be tt er
trac t io n un d er th ose condi t ion s. W e sugg es t yo u
use the recommen d ed s now or all- sea son tires
specified for your veh icle, or t heir equiva le nt .
Refer to c> page 24 9 for mo re de t ailed info rm a-
ti o n reg ardin g wi nt e r t ires.
Uniform tire quality grading
- Tread wear
- Tra ct ion AA A B C
- Tempe ratu re A B C
Quality g rades can be fo und where applicable o n
t he tire side wall between t read sho ulder and
max imum sect ion width c>pag e 235, fig . 169 .
For example: Tread wear 200 , Traction AA, Tem-
perature A.
All passen g er ca r t ires must conform to Fede ral
Safety Req uirements in addit io n to these grades .
Tread wear
The t read wear gra de is a com parat ive rat ing
based on the wea r rate of the t ire when teste d
under controlled con dit ions on a specified gov-
er nment test course.
For examp le, a t ire g ra de d 15 0 wou ld wea r on e
and one hal f (1 1/ 2) times as we ll on the govern -
me nt cou rse as a t ire gra d ed 10 0.
The re lati ve pe rforma nce of t ires de pends up on
th e actua l co nditi on s of t he ir us e, howeve r, and
may depa rt sig nifican t ly fr om t he no rm due t o
variations in driv ing habits, service practices a nd
diffe rences in road character istics and climate.
Traction
The t ract ion grades , fr om h ighest to lowes t , ar e
AA, A, B a nd C. Those g rades rep rese nt t he tire 's
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