height BUICK LACROSSE 2007 User Guide

(C) Aspect Ratio:A two-digit number that
indicates the tire height-to-width measurements.
For example, if the tire size aspect ratio is 60,
as shown in item C of the illustration, it would
mean that the tire’s sidewall is 60 percent as high
as it is wide.
(D) Construction Code:A letter code is used to
indicate the type of ply construction in the tire. The
letter R means radial ply construction; the letter D
means diagonal or bias ply construction; and the
letter B means belted-bias ply construction.
(E) Rim Diameter:Diameter of the wheel in
inches.
(F) Service Description:These characters
represent the load range and speed rating of the
tire. The load index represents the load carry
capacity a tire is certied to carry. The load index
can range from 1 to 279. The speed rating is
the maximum speed a tire is certied to carry a
load. Speed ratings range from A to Z.Tire Terminology and Denitions
Air Pressure:The amount of air inside the tire
pressing outward on each square inch of the
tire. Air pressure is expressed in pounds
per square inch (psi) or kilopascal (kPa).
Accessory Weight:This means the combined
weight of optional accessories. Some examples of
optional accessories are, automatic transmission/
transaxle, power steering, power brakes, power
windows, power seats, and air conditioning.
Aspect Ratio:The relationship of a tire’s height
to its width.
Belt:A rubber coated layer of cords that is
located between the plies and the tread. Cords
may be made from steel or other reinforcing
materials.
Bead:The tire bead contains steel wires wrapped
by steel cords that hold the tire onto the rim.
Bias Ply Tire:A pneumatic tire in which the plies
are laid at alternate angles less than 90 degrees
to the centerline of the tread.
406

Each new wheel should have the same
load-carrying capacity, diameter, width, offset
and be mounted the same way as the one
it replaces.
If you need to replace any of your wheels, wheel
bolts, or wheel nuts, replace them only with
new GM original equipment parts. This way,
you will be sure to have the right wheel, wheel
bolts, and wheel nuts for your vehicle.
{CAUTION:
Using the wrong replacement wheels,
wheel bolts, or wheel nuts on your vehicle
can be dangerous. It could affect the
braking and handling of your vehicle,
make your tires lose air and make you
lose control. You could have a collision
in which you or others could be injured.
Always use the correct wheel, wheel
bolts, and wheel nuts for replacement.Notice:The wrong wheel can also cause
problems with bearing life, brake cooling,
speedometer or odometer calibration,
headlamp aim, bumper height, vehicle ground
clearance, and tire or tire chain clearance
to the body and chassis.
SeeChanging a Flat Tire on page 426for more
information.
Used Replacement Wheels
{CAUTION:
Putting a used wheel on your vehicle is
dangerous. You cannot know how it has
been used or how far it has been driven.
It could fail suddenly and cause a crash.
If you have to replace a wheel, use a new
GM original equipment wheel.
423

Safety Belts (cont.)
Questions and Answers About
Safety Belts............................................ 20
Rear Safety Belt Comfort Guides............... 35
Rear Seat Passengers............................... 32
Right Front Passenger Position.................. 30
Safety Belt Extender.................................. 38
Safety Belt Use During Pregnancy............. 30
Safety Belts Are for Everyone.................... 16
Shoulder Belt Height Adjuster.................... 29
Safety Warnings and Symbols......................... 4
Scheduled Maintenance............................... 462
Seats
Center Seat............................................... 14
Head Restraints......................................... 13
Heated Seats............................................. 10
Power Lumbar........................................... 10
Power Seats................................................ 9
Reclining Seatbacks................................... 11
Split Folding Rear Seat.............................. 14
Securing a Child Restraint
Center Front Seat Position......................... 61
Rear Seat Position..................................... 58
Right Front Seat Position........................... 61
Security Light.............................................. 195Service........................................................ 340
Accessories and Modications.................. 341
Adding Equipment to the Outside of
Your Vehicle......................................... 343
California Proposition 65 Warning............. 341
Doing Your Own Work............................. 342
Engine Soon Light................................... 190
Publications Ordering Information............. 495
Vehicle Soon Light................................... 197
Servicing Your Airbag-Equipped Vehicle......... 80
Setting the Time.......................................... 239
Sheet Metal Damage................................... 445
Shifting Into Park (P)................................... 118
Shifting Out of Park (P)............................... 120
Shoulder Belt Height Adjuster........................ 29
Signals, Turn and Lane-Change.................. 152
Spare Tire
Compact.................................................. 437
Installing.................................................. 429
Removing................................................ 427
Storing..................................................... 435
Specications, Capacities............................ 454
Speedometer............................................... 181
Split Folding Rear Seat................................. 14
StabiliTrak
®System..................................... 296
509