2013 BMW 3 SERIES CONVERTIBLE wheel size

250
MobilityWheels and tires
Tire identification marks
Knowledge of the labeling on the side of the tire
makes it easier to identify and choose the right
tires.
Tire size
Speed code letter
Q = up to 100 mph or 160 km/h
T = up to 118 mph or 190 km/h
H = up to 131 mph or 210 km/h
V = up to 150 mph or 240 km/h
W = up to 167 mph or 270 km/h
Y = up to 186 mph or 300 km/h
Tire Identification Number
Tires with DOT codes meet the guidelines of
the US Department of Transportation.
DOT code:
Tire age
The manufacturing date of tires is contained in
the tire coding: DOT ... 1013 means that the tire
was manufactured in week 10 of 2013.
BMW recommends that you replace all tires
after 6 years at most, even if some tires may last
for 10 years.
Uniform Tire Quality Grading
Quality grades can be found where applicable
on the tire sidewall betw een tread shoulder and
maximum section width. For example:
Tread wear 200 Traction AA
Temperature A
DOT Quality Grades
Tread wear
Traction AA A B C
Temperature A B C
All passenger car tires must conform to
Federal Safety Requir ements in addition
to these grades. <
Tread wear
The tread wear grade is a comparative rating
based on the wear rate of the tire when tested
under controlled conditio ns on a specified gov-
ernment test course. For example, a tire graded
150 would wear one and one-half (1 γ) times as
well on the government course as a tire graded
100. The relative performance of tires depends
upon the actual conditio ns of their use, how-
ever, and may depart significantly from the
norm due to variations in driving habits, service
practices and differences in road characteris-
tics and climate.
Traction
The traction grades, from highest to lowest, are
AA, A, B, and C.
These grades represent the tire's ability to stop
on wet pavement, as measured under con-
trolled conditions on specified government test
surfaces of asphalt and concrete. A tire marked
C may have poor traction performance.
e.g.
Nominal width in mm
Aspect ratio
in
Ξ
Radial belt construction
Rim diameter in inches
Load rating,
not on ZR tires
Speed code letter, in
front of the R on ZR tires
225/45 R1791 V
e.g.
Manufacturer's
code for tire make
Tire size and
tire design
Tire ageDOT xxxx xxx 4012

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252
MobilityWheels and tires
Unusual vibrations encountered during normal
vehicle operation can indicate tire failure or
some other vehicle defect. This can, for exam-
ple, be caused by driving over curbs. The same
applies to any other abnormal road behavior,
such as pulling severely to the right or left.
In these cases, reduce speed immedi-
ately and have wheels and tires thor-
oughly checked. To do so , drive carefully to the
nearest BMW center or tire dealer. If necessary,
have the vehicle towed there.
O t h e r w i s e , t i r e d a m a g e c a n p o s e a l e t h a l h a z a r d
to vehicle occupants and other road users. <
Tire age
For various reasons, such as the development
of brittleness, BMW recommends tire replace-
ment after no more than 6 years, regardless of
the actual wear of the tires.
The manufacturing date of tires is contained in
the tire coding:
DOT ... 1013 means that the tire was manufac-
tured in week 10 of 2013.
New wheels and tires
Have new wheels and tires mounted only
by your BMW center or by a tire dealer. If
this work is not carried out properly, there is a
danger of subsequent damage and related
safety hazards. Make sure that the new wheels
are balanced. <
Retreaded tires
BMW recommends that you do not use
retreaded tires, since driving safety may
be impaired. The causes for this include poten-
tially different tire casing structures and often
wide variations in tire ag e, which can result in a
limited service life. <
Correct wheels and tires
When mounting new tires or changing over
from summer to winter tires and vice versa,
mount run-flat tires for your own safety. In the
event of a flat, no spare wheel is available. Your
BMW center will be glad to advise you.
BMW recommends that you use only
wheel and tire combinations that BMW
has tested and approved for your particular
vehicle. Variations in factors such as manufac-
turing tolerances mean that even wheels and
tires with identical offi cial size ratings could
actually have different dimensions, which could
lead to body contact an d thus to severe acci-
dents. If non-approved wheels and tires are
used, BMW cannot evaluate their suitability,
and therefore cannot guarantee their driving
safety. <
You can inquire about the right wheel/tire
combination at your BMW center.
The correct combination of wheels and tires is
also necessary to ensure reliable operation of
various vehicle systems such as ABS, DSC or
FTM.
To maintain good handling and vehicle
response, use only tires of a single brand and
tread configuration. Af ter a tire has been
damaged, mount the previous wheel and tire
combination again as soon as possible.
Wheels with Tire Pressure Monitor
TPM electronics
When mounting new tires or changing over
from summer to winter tires, or vice versa, only
use wheels with TPM electronics; otherwise,
the Tire Pressure Monito r may not be able to
detect a puncture, refer to page 102. Your
BMW center will be glad to advise you.

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253
Wheels and tires
Mobility
Recommended tire brands
Certain makes of tire are recommended by
BMW for each tire size. They are marked with a
clearly visible BMW designation on the sidewall
of the tire.
When properly used, these tires meet the high-
est standards in terms of safety and handling
characteristics.
Special characteristics of winter tires
BMW recommends winter tires for driving on
winter roads or at temperatures below +45
7/
+7 6. Although all-season M+S tires provide
better winter traction th an summer tires, they
generally fail to provide the same levels of cold-
weather performance as winter tires.
Pay attention to speed
Always comply with the speed limit for the
winter tires mounted on your car; failure
to do so could result in tire damage and
accidents. <
If the car is capable of speeds higher than that
permitted for the winter ti res, a label stating the
maximum permitted speed for the mounted
tires must be displayed in your field of view.
Specialist tire dealers and your BMW center
can supply these labels.
Storage
Always store wheels and tires in a cool, dry
place with as little exposure to light as possible.
Always protect tires agains t all contact with oil,
grease and fuels. Do not exceed the maximum
tire inflation pressure indicated on the sidewall
of the tire.
Swapping wheels between axles
BMW advises against swapping wheels
between the front and rear axles, even if all tires
have the same size, as th is could impair driving
characteristics. If the tires are of mixed sizes,
swapping wheels between the axles is not
permissible.
Run-flat tires
The symbol identifying run- flat tires is a circle
with the letters RSC on the sidewall.
Run-flat tires comprise a conditionally self-
supporting tire and a special rim. The reinforce-
ment in the sidewalls en sures that the tire can
continue to be used su bject to certain restric-
tions, even if depressurized.
For information on continuing to drive with a flat
tire, refer to Indication of a flat tire, page 101.

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303
Everything from A to Z
Reference
Switching off
– engine
64
Switching off the engine
– start/stop button 62
Switching on
– audio 166
– CD player 166
– radio 166
Switching the air conditioning on and off 118
Switching the entertainment
audio output on/off 166
Switch-on times of parked car ventilation, preselecting 119
Symbols 4
T
Tachometer 84
Tailgate, refer to Trunk lid 37
Tail lamp
– replacing bulb 269
Tail lamp, refer to Tail lamps 268
Tail lamps 268
– replacing bulb 268,269
Tank contents, refer to Capacities 282
Tasks 219
Technical data 280
– dimensions 280
Technical modifications, refer to For your own safety 5
Telephone 200
– hands-free system 209
– installation location, refer to Center armrest 124
– phone book 207
– received calls 208
– redialing 208
– refer to separate Owner's Manual
– voice commands 209TeleService
225
Teleservice Diagnosis 226
Temperature
– automatic climate control 116
– changing unit of measure 88
– coolant, refer to Coolant temperature 259
Temperature display
– outside temperature 83
– outside temperature
warning 83
– setting the units 88
Tempomat, refer to Cruise
control 74
Tensioning straps, refer to
Securing cargo 140
Text message 217
Third brake lamp, refer to
Center brake lamp 269
Through-loading opening with integrated transport
bag 131
Through-loading system 127
Tilt alarm sensor 39
Tilt function, passenger side mirror 56
Timer, refer to Preselecting
switch-on times 119
Tire inflation pressure 235
– loss 101,102
Tire pressure monitoring, refer to Flat Tire
Monitor 100
Tire Pressure Monitor TPM 102
– resetting the s

ystem103
– system limitations 102
– warning lamp 103
Tire puncture, refer to Flat Tire
Monitor 101
Tire Quality Grading 250Tires
– age
250,252
– air loss 103
– breaking in 136
– changing, refer to Changing
wheels 269
– condition 251
– damage 251
– inflation pressure 235
– labels 250
– minimum tread depth 251
– new wheels and tires 252
– pressure monitoring, refer to Flat Tire Monitor 100
– pressure monitoring, refer to Tire Pressure Monitor
TPM 102
– puncture 101
– replacing 252
– run-flat tires 253
– size 250
– storage 253
– tread depth 251
– wear indicators, refer to Minimum tread depth 251
– wheel/tire combination, refer to Correct wheels and
tires 252
– winter tires 253
TMC station, refer to Traffic bulletins 159
Tone
– control 167
– middle setting 168
Tools, refer to Onboard vehicle tool kit 266
Top, refer to Retractable
hardtop 44
Top 50 in music collection 186
Tow bar 276
Tow fitting 275
– screw thread 275

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