Page 321 of 446

Aftery ou ha vedriven foraf ewminutes, the
sy stem checks whe ther thec urrent tir epres‐
sure sarewithin thes pecified range. The cur‐
re nt tir epressures ar ethen accep tedasr ef‐
erence values and monitored.
Be sur etoalso observ ethe following fur ther
re lated subjects:
RNo tesont irep ressur e(→page312)
Ra dio-type appr oval of thet irep ressure
moni toring sy stem
Ra dio equipment appr oval number
Countr yRadio equipment appr oval
number
Canada
USA FCC ID: MRX
AG5SP4
FCC ID: MRXMFR
IC: 2546A -AG5SP4
Loading thev ehicle
Tire and Loading Information placard
&
WARNING Risk of accident from overloa‐
ded tires
Overloaded tires ma yoverheat and bur stas a
consequence. Overloaded tires can also
impair thes teering and handling characteris‐
tic sa nd lead tobrak efailure.
#Obser vethel oad rating of thet ires.
#The load rating must be at leasthalf the
permissible axle load of thev ehicle.
#Nevero verload thet ires by exc eeding
th em aximum load.
The Tire and Loading Info rmatio nplacar diso n
th eB -pillar on thed rive r's side of thev ehicle.
1Tire and Loading Info rmatio nplacard
Wheels and tires 31
9
Page 322 of 446

%The dat ashown in thei mag eise xamp le
data.
The Tire and Loading Info rmatio nplacar dshows :
RMaximum number of seats 2according to
th em aximum number of people permitted to
tr ave lint hevehicle
RMaximum permissible load 3comprises the
gross weight of all vehicle occupants, load
and luggage.
RRe commended tir epressure 1forc old
tires. The recommended tir epressures are
va lid fort he maximum permissible load and
up tothem aximum permissible vehicle
speed.
Please also no te:
RInformation on permissible weightsa nd loads
on thev ehicle identification plate
(
→pag e342).
RInformation on tir epressur eint he tir epres‐
sur etable (→pag e314).
Fu rther related subjects:
RDe term inin gthe maximum permissible load
(→pag e320)
RNotesont irep ressur e(→page312)
De term ining them aximum permissible load
The following steps ha vebeen de veloped as
re qu ired of all manufacturer sunder Title 49,
Code of U.S. Federal Regulations, Part57 5, pur‐
suant tothe" Na tional Traf fica nd Mo torV ehicle
Saf etyA ct of 1966".
#Ste p1:Loca tethes tatement" The combined
we ight of occupant sand cargo should ne ver
exc eed XXX kgor XXX lbs." ("The combined
we ight of occupant sand cargo should ne ver
exc eed XXX kgor XXX lbs.") on your vehicle's
tir ea nd loading information table.
#Ste p2:De term ine thec ombined weight of
th ed rive ra nd passenger sthat will be riding
in your vehicle.
#Ste p3:Subtract thec ombined weight of the
driver and passenger sfromX XXkgor
XXX lbs.
#Ste p4:The resulting figur eequals thep er‐
missible load forc argo and lug gage .F or
ex ample: If "XXX"e quals 1400 lbs and there
ar ef iveo ccupantsiny ourvehicle wit ha
we ight of 150lbs each, them aximum cargo
and luggag eload capacity is 650 lbs (1400 -
75 0(5x1 50)= 650 lbs).
#Step5:De term ine thec ombined weight of
luggag eand cargo being car ried in thev ehi‐
cle. Fors afet yr easons, this we ight ma ynot
safel yexceed thea vailable cargo and lug‐
ga ge load capacity calculated in step 4.
320
Wheels and tires
Page 323 of 446

Even ifyouh avec alculated thet otal load care‐
full y,yo us hould still mak esuret hat them axi‐
mum permissible gross mass and them aximum
permissible axle load of your vehicle ar enot
exc eeded. De tails can be found on thev ehicle
identification plate.
#Ha ve your loaded vehicle –including driver,
occupants and load –weighed on avehicle
we ighbridge.
The measured values ma ynotexc eed the
maximu mpermissible values stated on the
ve hicle identification plate. Fu
rther related subjects:
RCalculation example ford eterminingt he max‐
imum load (→pag e321)
RTire and Loading Info rmatio nplacard
(→pag e319)
RTire pressur etable (→pag e314)
RVehicle identification plat e(→page342)
Calculation example ford eter mi ning the
ma ximum load
The following table sho wsexamples of ho wto
calculat etotal and load capacities wit hvarying seatin
gconfigurations and dif fere nt numbe rs
and sizes of occupants. The following examples
use amaximum load of 1500 lbs (680 kg).This
is fori llustratio npurposes on ly.Mak esure
yo ua reusingt he actual load limit fory our vehi‐
cle stated on your vehicle's Tire and Loading
Info rmatio nplacar d(
→page319).
Th eh igher thew eight of all theo ccupants, the
smaller them aximum load forl ug gage .
Ste p1
Example 1E xamp le 2
Combine dmaximum weight of occupant sand
cargo (dat afromt heTire and Loading Info rma‐
tio np lacard) 15
00 lbs (680 kg)1 500 lbs (680kg)
Wheels and tires 321
Page 324 of 446
Step2
Example 1E xamp le 2
Numb er of people in thev ehicle (driver and
occupants) 51
Distribution of theo ccupantsF ront:2
Re ar:3 Fr
ont :1
We ight of occupant sO ccupant 1:150lbs (68 kg)
Occupant 2: 180lbs (82 kg)
Occupant 3: 160lbs (7 3kg)
Occupant 4: 140lbs (63 kg)
Occupant 5: 120lbs (5 4kg) Occupant 1: 200 lbs (9
1kg)
To talw eight of all occupant s7 50 lbs (340kg)2 00 lbs (91kg)
Ste p3
Example 1E xamp le 2
Pe rm issible load (maximum grossvehicle weight
ra ting from theT irea nd Loading Info rmation
placar dminus theg ross we ight of all occupants) 15
00 lbs (680 kg)Ò 75 0lbs (340 kg)=7 50 lbs
(340 kg) 15
00 lbs (680 kg)Ò 200 lbs (9 1kg)= 1 300 lbs
(589 kg)
322
Wheels and tires
Page 325 of 446

Tire labeling
Overvie woftirel abeling
1Uni form Ti reQuality Grading Standard
(→pag e323)
2DO T(Department of Transpor tation), (TIN)
Ti re Identification Number (→pag e324)
3Maximu mtirel oad(→pag e325)
4Maximu mtirep ressure (→page325)
5Manufacturer
6Tire characteristic s(→page326)
7Tire size designation, load rating ,speed rat‐
ing and load ind ex(→pag e326)
8Tire name
% The da tashown in thei mag eise xamp le
data.
Ti re Quality Grading
In accordance wit hthe US Department of Trans‐
por tation's "Unifo rm TireQuality Grading Stand‐
ards", tir emanufacturer sare re quired tograde
th eir tires on theb asis of thef ollowing thre ep er‐
fo rm anc efactors:1Tread weargrade
2Traction grade
3Te mp eratur egrade
% The dat ashown in thei mag eise xamp le
data.
% The classification is no tlegall ystipulated for
Canada, but it is general lystated.
Tr ead weargrade
The tread wear grade is acomparativ erating
based on thew ear rate ofthet irew hen tested
under controlled conditions on aspecified test
trac koft he US Department of Transpor tation.
Fo re xamp le,atireg raded 150w ould wear one
Wheels and tires 323
Page 326 of 446

and one-half times aswell on theg ove rnment
course as atireg rade d1 00.
The relativ eperform anc eoft ires depends upon
th ea ctual conditions of their use, ho wever,and
ma ydepar tsignificantl yfromt he nor mdueto
va riations in drivin ghabits, servic epractice sand
dif fere nces in road characteristic sand climate
conditions.
Tr actio ngrade
&
DANG ER Risk of accidentd uetoinade‐
qu atet raction
The traction grade assigned tothis tir eis
based on stra ight-ahead brakin gtraction
te sts, and does no tinclude either accelera‐
tion, cornering, hydroplaning or peak traction
ch aracteristics.
#Alw aysa dap tyour driving stylea nd
driv eatas peedtosuit thep reva iling
traf fica nd weather conditions.
* NO
TEDama getothed rive trai nfrom
wheelspin
#Av oid wheelspin.
The traction grades –fromh ighes ttolowest –
ar eA A, A, Band C. Those grades represent the
tire' sabili tyto stop on wetpave ment as meas‐
ured under controlle dconditions on specified
go vernment test sur faces mad eofasphalt and
concr ete.
Te mp eratur egrade
&
WARNING Risk of accident from tire
ove rheating and tir efailure
The temp eratur egrade fort his tir eisestab‐
lishedf oratiret hat is properly inflated and
no to verloaded. Excessiv espeed, underinfla‐
tion, or excessiv eloading, either separately
or in combination, can cause excessiv eheat
build-up and possible tir efailure.
#Obser vether ecommende dtirep res‐
sure sand regularly checkt he tir epres‐
sur eofa ll tires including thes pare
wheel.
#Ad jus tthe tir epressur easn ecessar y.
Thetemp eratur egrades ar eA(theh ighest), B
and C. The yrepresent thet ire's resis tance tothe
ge neration of hea tand its ability todissipate
heat when tested under controlled conditions on
as pecified indoor laborator ytestw heel. Sus‐
ta ined high temp eratures can cause them aterial
of thet iretod egenerat eand reduce tir elife. Fur‐
th ermore, excessiv etemperatures can lead to
sudden tir efailure. Grade Ccorresponds toa
le ve lofp erform anc ewhicha ll passenger car
tires mus tmeetu nde rthe requ irements of the
US Department of Transpor tation.
DO T,Tire Identification Numbe r(TIN)
US tir eregulations stipulat ethat everytirem an‐
ufactu rerorr etre ader must imprint aTIN in or
on thes ide wall of eac htirep roduced.
324
Wheels and tires
Page 327 of 446

%The dat ashown in thei mag eise xamp le
data.
The TIN is aunique identification number to
identify tires and comprises thef ollowing:
RDO T(Department of Transport ation):tire
symbol mar ks: indicatin gthat thet ire
complies wit hthe requ irements of theU S
Departmen tofTranspor tation.
RManufacturer identi fication code: manu‐
fa cturer identification code ;contains
de tails of thet irem anufacturer .New tires
ha ve ac odew itht wo symbols. Retreade dtire
ha ve ac odew ithf our symbols .Further infor‐
mation on retreade dtires (
→page 331).
RTire size: identifier =describes thet ire
size.
RTi re type code: tiret ypec ode ?can be
used bythem anufacturer as acode to
describe specific characteristic softhe tire.
RManufacturing date: manufacturing dateA
pr ov ides informatio nabout thea geofat ire.
The 1s tand 2nd position srepresent thec al‐
endar week and the3 rdand 4t hpositions
st at et he year of manufactur e(e.g. "3208"
re present sthe 32nd week of 2008).
Information on them aximum tir eload
%
The dat ashown in thei mag eise xamp le
data.
Maximum tir eload 1isthem aximum permissi‐
ble weight forw hich thet ireisa pprove d.
Do no toverload thet ires by ex ceeding thes peci‐
fi ed load limit. The maximum permissible load
can be found on thev ehicle's Tire and Loading
Info rmatio nplacar dont he B-pillar on thed riv‐
er's side (
→pag e319).
Speci fications form aximum tir epress ure
%
The da tashown in thei mag eise xamp le
data.
Wheels and tires 325
Page 328 of 446

Nevere xceed maximum tir epressure 1speci‐
fi ed fort he tire.
Information on tir echaracteristics
%
The dat ashown in thei mag eise xamp le
data.
This information descri besthet ype of tir ecord
and then umber of la yers in side wall1 and
under tir etread 2.
Tire size designation, load-bearing capacity,
speed ratin ga nd load index
&
WARNING Risk of accident duet o
exc eeding thes tatedt irel oad rating or
th ea ppr ove dspeed rating
Exceeding thes pecified tir eload rating or
th ep ermissible speed rating ma ylea dtot ire
damage andtothet ires bur sting.
#Therefore, onl yuse tir etypes and sizes
appr ovedfor your vehicle model.
#Obser vethet irel oad rating and speed
ra ting requ ired fory our vehicle.
1Preceding letter
2Nominal tir ewidthinm illimeters
3Aspect ratio in %
4Tire code
5Rimd iame ter
6Load-bearing index
7Speed rating
8Loa dind ex
% The dat ashown in thei mag eise xamp le
data.
Info rmatio nabout readingt he tiredatac an be
obtained from an yqualified specialis tworks hop.
326
Wheels and tires