wheel size SMART FORTWO COUPE 2015 User Guide

The traction grades, from highest to low-
est, are AA, A, B, and C. Those grades rep-
resent the tire’s ability to stop on wet
pavement as measured under controlled
conditions on specified government test
surfaces of asphalt and concrete. A tire
marked C may have poor traction perform-
ance.
Temperature G
WARNING
The temperature grade for this tire is
established for a tire that is properly
inflated and not overloaded. Excessive
speed, underinflation, or excessive load-
ing, either separately or in combination,
can cause excessive heat build-up and pos- sible tire failure.
The temperature grades are A (the highest),
B, and C, representing the tire’s resistance to the generation of heat and its ability todissipate heat when tested under control-
led conditions on a specified indoor lab-
oratory test wheel. Sustained high temper- ature can cause the material of the tire to
degenerate and reduce tire life, and
excessive temperature can lead to sudden
tire failure. The grade C corresponds to a
level of performance which all passenger
car tires must meet under the Federal Motor
Vehicle Safety Standard No. 109. Grades B
and A represent higher levels of perform-
ance on the laboratory test wheel than the
minimum required by law. Rotating tires
G
WARNING
Do not rotate front and rear wheels as they
have different dimensions, e.g. rim size,
wheel offset etc. Otherwise, the handling
can be affected and you could endanger
yourself and others. Thoroughly clean the mounting face of the
wheels and brake discs, i.e. the inner side of the wheels/tires each time the wheels/
tires are changed. Check for and ensure
proper tire inflation pressure. G
WARNING
Have the tightening torque checked after
changing a wheel. Wheels could become
loose if not tightened with a torque of
81 lb‑ft (110 Nm).
Only use genuine smart wheel bolts speci-
fied for your vehicle’s rims.
For information on wheel change, see “Flat
tire” (Y page 187). Tire labeling
Besides tire name (sales designation) and
manufacturer name, a number of markings
can be found on a tire.
Following are some explanations for the
markings on your vehicle’s tires: :
Uniform Quality Grading Standards
(Ypage 138)
; DOT, Tire Identification Number (TIN)
(Ypage 142)
= Maximum tire load (Y page 136)
? Maximum tire inflation pressure
(Ypage 133) Tires and wheels
139>> Operation. Z

A
Manufacturer
B Tire ply material (Y page 143)
C Tire size designation, load and speed
rating (Y page 140)
D Load identification (Y page 142)
E Tire name
i For illustration purposes only. Actual
data on tires are specific to each vehicle and may vary from data shown in above
illustration.
For more information, see “Rims and
tires” (Y page 216).
Tire size designation, load and speed
rating :
Tire width
; Aspect ratio in %
= Radial tire code
? Rim diameter
A Tire load rating
B Tire speed rating
i For information purposes only. Actual
data on tires are specific to each vehicle and may vary from data shown in above
illustration.
General:
Depending on the design standards used,
the tire size molded into the sidewall may
have no letter or a letter preceding the tire
size designation.
No letter preceding the size designation
(as illustrated above): Passenger car tire
based on European design standards. Letter “P” preceding the size designation:
Passenger car tire based on U.S. design
standards.
Letter “LT” preceding the size designa-
tion: Light Truck tire based on U.S. design
standards.
Letter “T” preceding the size designation: Temporary spare tires which are high pres-
sure compact spares designed for tempo-
rary emergency use only.
Tire width
Tire width :indicates the nominal tire
width in mm.
Aspect ratio
Aspect ratio ;is the dimensional rela-
tionship between tire section height and
section width and is expressed as a per-
centage. The aspect ratio is arrived at by
dividing section height by section width.
Tire code
Tire code =indicates the tire construc-
tion type. The “R” stands for radial tire
type. Letter “D” means diagonal or bias ply
construction; letter “B” means belted-bias
ply construction.
At the tire manufacturer’s option, any tire
with a speed capability above 149 mph
(240 km/h) can include a “ZR” in the size
designation (for example: 245/40 ZR 18).
For additional information, see “Tire
speed rating” (Y page 141).
Rim diameter
Rim diameter ?is the diameter of the
bead seat, not the diameter of the rim edge. Rim diameter is indicated in inches (in).
Tire load rating G
WARNING
The tire load rating must always be at least
half of the GAWR of your vehicle. Otherwise, tire failure may result and cause an acci-
dent and/or serious personal injury to you
or others. 140
Tires and wheels>> Operation.

Always replace rims and tires with the same
designation, manufacturer and type as
shown on the original part. G
WARNING
Do not overload the tires by exceeding the
specified load limit as indicated on the
Tire and Loading Information placard on
the driver’s door B‑pillar. Overloading the tires can overheat them, possibly causing a
blowout. Overloading the tires can also
result in handling or steering problems, or brake failure.
Tire load rating Ais a numerical code
associated with the maximum load a tire
can support.
For example, a load rating of 91 corre-
sponds to a maximum load of 1356 lbs
(615 kg) the tire is designed to support.
See also “Maximum tire load” (Y page 136)
where the maximum load associated with
the load index is indicated in kilograms
and lbs.
For additional information on tire load
rating, see “Load identification”
(Y page 142).
Tire speed rating G
WARNING
Even when permitted by law, never operate a
vehicle at speeds greater than the maximum speed rating of the tires.
Exceeding the maximum speed for which
tires are rated can lead to sudden tire fail-
ure, causing loss of vehicle control and
possibly resulting in an accident and/or
personal injury and possible death, for you and for others.
Regardless of the tire speed rating, local
speed limits should be obeyed. Use prudent driving speeds appropriate to prevailing
conditions.
Tire speed rating Bindicates the
approved maximum speed for the tire. Summer tires Index Speed rating
Q up to 100 mph (160 km/h)
R up to 106 mph (170 km/h)
S up to 112 mph (180 km/h)
T up to 118 mph (190 km/h)
H up to 130 mph (210 km/h)
V up to 149 mph (240 km/h)
W up to 168 mph (270 km/h)
Y up to 186 mph (300 km/h)
ZR...Y above 186 mph (300 km/h)
ZR...(Y) above 186 mph (300 km/h)
ZR above 149 mph (240 km/h)
R
At the tire manufacturer’s option, any
tire with a speed capability above
149 mph (240 km/h) can include a “ZR” in
the size designation (for example:
245/40 ZR18). To determine the maximum
speed capability of the tire, the service description for the tire must be referred to.
The service description is comprised of
tire load rating Aand tire speed rating
B.
If your tire includes “ZR” in the size
designation and no service description
is given, the tire manufacturer must be
consulted for the maximum speed capa-
bility.
If a service description is given, the
speed capability is limited by the speed
symbol in the service description.
Example: 245/40 ZR18 97Y.
In this example, “97Y” is the service
description. The letter “Y” designates
the speed rating and the speed capabil- Tires and wheels
141>> Operation. Z

ity of the tire is limited to 186 mph
(300 km/h).
R Any tire with a speed capability above
186 mph (300 km/h) must include a “ZR” in
the size designation AND the service
description must be placed in parenthe- sis. Example: 275/40 ZR 18 (99Y). The “(Y)”speed rating in parenthesis designates
the maximum speed capability of the tire
as being above 186 mph (300 km/h). Con-
sult the tire manufacturer for the actual
maximum permissible speed of the tire.
All-season and winter tires Index Speed rating
Q M+S
7 up to 100 mph (160 km/h)
T M+S
7 up to 118 mph (190 km/h)
H M+S
7 up to 130 mph (210 km/h)
V M+S
7 up to 149 mph (240 km/h)
i
Not all M+S rated tires provide special
winter performance. Make sure the tires
you use show M+S and the mountain/snow-
flake marking ion the tire sidewall.
These tires meet specific snow traction
performance requirements of the Rubber
Manufacturers Association (RMA) and the Rubber Association of Canada (RAC) and
have been designed specifically for use
in snow conditions. Load identification
i
For illustration purposes only. Actual
data on tires are specific to each vehicle and may vary from data shown in above
illustration.
In addition to the tire load rating, special
load identification :may be molded into
the tire sidewall following the letter des-
ignating the tire speed rating B
(Y page 141).
No specification given: absence of any text (like in above example) indicates a stand-
ard load (SL) tire.
XL or Extra Load: designates an extra load
(or reinforced) tire.
Light Load: designates a light load tire.
C, D, E: designates load range associated
with the maximum load a tire can carry at a
specified pressure. DOT, Tire Identification Number (TIN)
U.S. tire regulations require each new tire
manufacturer or tire retreader to mold a
TIN into or onto a sidewall of each tire
produced.
7 or M+S ifor winter tires. 142
Tires and wheels>> Operation.

The TIN is a unique identifier which facil-
itates efforts by tire manufactures to
notify purchasers in recall situations or
other safety matters concerning tires and
gives purchasers the means to easily iden- tify such tires.
The TIN is comprised of “Manufacturer’s
identification mark” ;, “Tire size”=,
“Tire type code” ?, and “Date of manufac-
ture” A.
i For illustration purposes only. Actual
data on tires are specific to each vehicle and may vary from data shown in above
illustration.
DOT (Department of Transportation) Tire branding symbol
:which denotes the
tire meets requirements of the U.S. Depart- ment of Transportation.
Manufacturer’s identification mark Manufacturer’s identification mark
;
denotes the tire manufacturer.
New tires have a mark with two symbols.
Retreaded tires have a mark with four sym-
bols. For more information on retreaded
tires (Y page 127).
Tire size Code
=indicates the tire size. Tire type code Tire type code
?may, at the option of the
manufacturer, be used as a descriptive
code for identifying significant charac-
teristics of the tire.
Date of manufacture Date of manufacture
Aidentifies the week
and year of manufacture.
The first two figures identify the week,
starting with “01” to represent the first
full week of the calendar year. The second
two figures represent the year.
For example, “3202” represents the 32nd
week of 2002. Tire ply material
i
For illustration purposes only. Actual
data on tires are specific to each vehicle and may vary from data shown in above
illustration.
This marking tells you about the type of
cord and number of plies in the sidewall :
and under the tread ;. Tire and loading terminology
Accessory weight The combined weight (in excess of those
standard items which may be replaced) of
transmission, power steering, power
brakes, power windows, power seats, radio, Tires and wheels
143>> Operation. Z

Normal occupant weight
The number of occupants the vehicle is
designed to seat, multiplied by 68 kilo-
grams (150 lbs).
Occupant distribution The distribution of occupants in a vehicle
at their designated seating positions.
Production options weight The combined weight of those installed
regular production options weighing over
5 lbs (2.3 kilograms) in excess of those
standard items which they replace, not
previously considered in curb weight or
accessory weight, including heavy duty
brakes, ride levelers, roof rack, heavy duty
battery, and special trim.
PSI (Pounds per square inch) A standard unit of measure for air pres-
sure.
Recommended tire inflation pressure The recommended tire inflation pressure
for normal driving conditions is listed on
the Tire and Loading Information placard
located on driver’s door B‑pillar and pro-
vides best handling, tread life and riding
comfort.
Rim A metal support for a tire or a tire and tube
assembly upon which the tire beads are
seated.
Sidewall The portion of a tire between the tread and
the bead. TIN (Tire Identification Number) Unique identifier which facilitates
efforts by tire manufacturers to notify
purchasers in recall situations or other
safety matters concerning tires and gives
purchasers the means to easily identify
such tires. The TIN is comprised of “Man-
ufacturer’s identification mark”, “Tire
size”, “Tire type code” and “Date of manu-
facture”.
Tire load rating Numerical code associated with the maxi-
mum load a tire can support.
Tire ply composition and material used This indicates the number of plies or the
number of layers of rubber-coated fabric
in the tire tread and sidewall. Tire manu-
facturers also must indicate the ply mate-
rials in the tire and sidewall, which
include steel, nylon, polyester, and others.
Tire speed rating Part of tire designation; indicates the
speed range for which a tire is approved.
Total load limit Rated cargo and luggage load plus 68 kilo-
grams (150 lbs) times the vehicle’s desig-
nated seating capacity.
Traction Force exerted by the vehicle on the road via
the tires. The amount of grip provided.
Tread The portion of a tire that comes into con-
tact with the road. Tires and wheels
145>> Operation. Z

imately
1
/ 6 in (4 mm) on all four wheels for
the winter season to ensure normal bal-
anced handling characteristics. On packed
snow, they can reduce your stopping dis-
tance compared to summer tires.
Stopping distance, however, is still con-
siderably greater than when the road is not covered with snow or ice. Exercise appro-
priate caution.
! Avoid spinning of a drive wheel for an
extended period when driving off on
slippery road surfaces. Otherwise, the
drivetrain could be damaged, which is
not covered by the smart Limited War-
ranty. Tire speed rating
Regardless of the tire speed rating, local
speed limits should be obeyed. Use prudent
driving speeds appropriate to prevailing
conditions. G
WARNING
Even when permitted by law, never operate a
vehicle at speeds greater than the maximum speed rating of the tires.
Exceeding the maximum speed for which
tires are rated can lead to sudden tire fail-
ure, causing loss of vehicle control and
possibly resulting in an accident and/or
personal injury and possible death, for you and for others.
Make sure your tires have the required tire speed rating as specified for your vehicle
in the “Technical data section”
(Y page 216), for example when purchasing
new tires.
For information on how to identify the tire
speed rating on a tire’s sidewall, see “Tire size designation, load and speed rating”
(Y page 140).
If you are uncertain about the correct read-
ing of the information given on a tire’s sidewall, any authorized electric drive
smart center will be glad to assist you.
i For information on speed ratings for
winter tires, see “All-season and winter
tires” (Y page 141). Winter driving instructions
The most important rule for slippery or icy roads is to drive sensibly and to avoid
abrupt acceleration, braking and steering
maneuvers.
For information on driving with snow
chains*, see “Snow chains*” (Y page 146).
Road salts and chemicals can adversely
affect braking efficiency. Increased pedal force may become necessary to produce the
normal braking effect.
Depressing the brake pedal periodically
when traveling at length on salt-strewn
roads can bring road-salt-impaired brak- ing efficiency back to normal.
If the vehicle is parked after being driven
on salt-treated roads, the braking effi-
ciency should be tested as soon as possible after driving is resumed. G
WARNING
Make sure not to endanger any other road
users when carrying out these braking
maneuvers. G
WARNING
The outside temperature display is not
designed to serve as an ice-warning device and is therefore unsuitable for that pur-
pose. Indicated temperatures just above
the freezing point do not guarantee that the
road surface is free of ice.
For more information, see “Winter driving”
(Y page 146). Driving instructions
151>> Operation.
* optional Z

Display messages Possible causes/consequences and
M
MSolutions è
Charge Cable Con‐ Charge Cable Con‐
nected nected The charging cable is inserted in the vehicle power socket. The
vehicle cannot be moved.
In addition, a warning signal sounds.
X To drive off, remove the charging cable from the vehicle
power socket and stow the cable in the vehicle. Ready to Charge Ready to Charge
The vehicle is prepared for the high‑voltage battery to be
charged. It may take 30 seconds for the charging process to
begin.
Malfunction Malfunction
Despite the charging cable being correctly inserted in the
vehicle power socket, the high‑voltage battery does not
charge. There is a malfunction in the on-board charger.
X Contact an authorized electric drive smart center. No Charge No Charge
The voltage on the vehicle power socket is too low.
X Check whether the charging cable is inserted correctly in
the power sockets of both the vehicle and the power source. If necessary, unplug the charging cable from both sockets and
reinsert it.
If, afterwards, the message is still displayed:
X Contact an authorized electric drive smart center. Display messages Possible causes/consequences and
M MSolutions h
Check Check
Tire
TirePressure
Pressure The tire inflation pressure in at least one tire is signifi-
cantly below the reference value.
X Carefully bring the vehicle to a halt, avoiding abrupt steer-
ing and braking maneuvers.
X Check and adjust tire inflation pressure as required
(Y page 130).
X If necessary, change the wheel (Y page 195).G
WARNING
Each tire should be checked monthly when cold and inflated to the inflation pressure rec-
ommended by the vehicle manufacturer on the Tire and Loading Information placard. If your vehicle has tires of a different size than the size indicated on the Tire and Loading Infor- mation placard, you should determine the proper tire inflation pressure for those tires.
As an added safety feature, your vehicle has been equipped with a tire pressure monitoring
system (TPMS) that illuminates a low tire pressure telltale when one or more of your tires is
significantly underinflated. 164
Display messages>> Practical hints.

Wheel change
Preparing the vehicle
X Park the vehicle on a hard, flat surface
when possible.
X Turn on the hazard warning flasher.
X Turn the steering wheel so that the front
wheels are in a straight-ahead position.
X Engage the parking brake.
X Move the gear selector lever to park
position P.
X Switch off the drive system.
X Have any passenger exit the vehicle at a
safe distance from the roadway. Removing the wheel
G
WARNING
When jacking up the vehicle, only use a
suitable jack. Observe the manufacturer’s
safety instructions.
The jack must be designed for jacking up
this vehicle at the jack take-up brackets
built into both sides of the vehicle.
The jack is intended only for lifting the
vehicle briefly for wheel changes. It is not suited for performing maintenance work
under the vehicle. To help avoid personal
injury, use the jack only to lift the vehicle during a wheel change.
Never get beneath the vehicle while it is
supported by the jack. Keep hands and feet
away from the area under the lifted vehicle.
Always lower the vehicle onto sufficient
capacity jackstands before working under
the vehicle.
Always firmly engage the parking brake and block the wheels with wheel chocks or othersizeable objects before raising the vehi-
cle with the jack. Do not release the parking
brake while the vehicle is raised.
Make sure the ground on which the vehicle
is standing and where you place the jack is solid, level and not slippery. If necessary,
use a large underlay. On slippery surfaces, such as tiled floors, you should use a non-
slip underlay, for example a rubber mat.
Do not use wooden blocks or similar objects
to support the jack. Otherwise the jack may
not be able to achieve its load-bearing
capacity if it is not at its full height.
The jack must always be vertical when in
use. Always try to use the jack on level sur- face. If you do not position the jack cor-
rectly, the vehicle can fall off the jack and
seriously or fatally injure you or others.
Never switch on the drive system when the
vehicle is raised.
Also observe the notes on the jack.
X Make sure to have a suitable jack 10
, wheel
wrench 10
and wheel chock 10
.
Contact an authorized electric drive
smart center for information on which
jack and wheel wrench are required.
X Prepare the vehicle as described
(Y page 195).
X Make sure the surface is level.
Prevent the vehicle from rolling away by
blocking wheels with wheel chocks or other sizeable objects:
X Place one wheel chock or other sizeable
object in front of and another wheel
chock or other sizeable object behind
the wheel that is diagonally opposite to
the wheel being changed.
X On wheel to be changed, loosen but do not
yet remove the wheel bolts (approx-
imately one full turn with wheel wrench).
! Only position the jack on the designa-
ted take-up brackets.
You must not position the jack under the
high-voltage battery. Otherwise, the
high-voltage battery could be damaged.
10 Not included and not available as factory equipment. Wheel change
195>> Practical hints. Z

Mixed size tires
i Abbreviations used in the following tables:
R FA: Front Axle
R RA: Rear Axle All-season tires Light alloy rims
FA
RA 155/60 R 15 74T M+S
175/55 R 15 77T M+S 4.5 J x 15 H2
Wheel offset: 0.93 in (23.5 mm)
5.5 J x 15 H2
Wheel offset: 0.87 in (22 mm)
Winter tires
12 Light alloy rims
FA
RA 155/60 R 15 74T M+Si
175/55 R 15 77T M+Si 4.5 J x 15 H2
Wheel offset: 0.93 in (23.5 mm)
5.5 J x 15 H2
Wheel offset: 0.87 in (22 mm)
Service fluids and capacities
Notes
Vehicle components and their respective
lubricants must match. Therefore only use
products tested and approved by smart.
Please contact an authorized electric
drive smart center for products tested and
approved by smart. G
WARNING
Comply with all valid regulations with
respect to handling, storing and disposing of service fluids. Otherwise you could
endanger persons or the environment.
Keep service fluids out of the reach of chil-
dren.
For health reasons, you should prevent ser-
vice fluids from coming into direct contact with your skin or clothing.
If a service fluid is swallowed, contact a
physician immediately.
12 Not available as factory equipment. Service fluids and capacities
217>> Technical data. Z