04-03-10-013I Service Bulletin/Repair Instructions

File in Section:
Service Bulletin
Bulletin No.:

Date:
03 - Suspension

04-03-10-013I

December, 2014
INFORMATION

Subject:
Driving Characteristics of Rear-Wheel Drive Vehicles and Available Winter Tires
Models:
2012-2015 Buick Regal GS

2013-2015 Cadillac ATS

2010-2013 Cadillac CTS Sedan

2014-2015 Cadillac CTS Sedan (VIN A)

2010-2015 Cadillac CTS-V

2014-2015 Cadillac CTS-V Sport

2010-2014 Cadillac CTS Wagon

2011-2015 Cadillac CTS Coupe

2010-2015 Chevrolet Camaro

2012-2015 Chevrolet Camaro ZL1

2014-2015 Chevrolet Camaro Z28

2014-2015 Chevrolet Corvette, Corvette Z51

2014-2015 Chevrolet SS
Attention: This Bulletin also applies to any of the above models that may be Europe, Russia,

Japan, South Korea and China Export vehicles.

This Bulletin has been revised to add the 2015 Model Year, remove the Pontiac G8 and

Cadillac STS and to update the Available Winter Tires table. Some vehicles have the same

recommended tires as the last revision of this document, but have revised part numbers.

Please discard Corporate Bulletin Number 04-03-10-013H.
Increasing Winter Traction

Many General Motors high performance models come factory equipped with tires that are optimized for maximum

dry and wet road performance while still retaining satisfactory tread life, excellent durability and low noise levels. In

severe winter climates where snowfall may be significant, these tires may be found to provide less traction. Winter

tires are a viable alternative that may greatly enhance winter driving.

Recent General Motors performance oriented vehicles being introduced are rear wheel drive. Rear wheel drive takes

advantage of the natural weight shift rearward during acceleration increasing dry road traction on the driven wheels.

Rear wheel drive also contributes to neutral steering as it takes the burden off the front wheels to both power and

turn the vehicle. The connection between the steering and the powertrain is also eliminated, removing any tendency

for engine power to influence the steering under heavy acceleration or rough roads.

Generally front wheel drive vehicles offer additional winter traction due to the weight of the engine / transaxle sitting

directly above the driving wheels, and are found to be satisfactory for winter driving when factory equipped with

all-season tires. In the case of the Regal GS, this model is offered with All-Season or Summer (3 season)

performance tires that optimize dry and wet handling. Winter Tires may greatly enhance the available traction on this

vehicle if originally equipped with “Summer” tires. (The Regal GS is also available in AWD both with Summer or

All-Season Tires. Summer tire equipped models will perform better in the snow with Winter Tires)
Use and Application Tips

The vehicles listed in this bulletin are rear-wheel drive with the exception of the Buick Regal GS, which is front wheel

drive. In ALL cases, if a decision is made to switch to winter tires, you MUST replace all four tires. When selecting

winter tires, you should keep to the same size and aspect ratio as the original equipment tires, unless otherwise

directed by the chart below. If you deviate from the original size, you may create clearance issues, speedometer

error and/or alter the handling characteristics of the vehicle. These factors have been considered in the

recommendations below. No other variance in size should be considered.

Acknowledge Any Revised Speed Ratings and Adjust Your Driving Accordingly

Winter tires, in general, are optimized for increased traction on snow and ice. In some instances, this may translate

into decreased dry road traction, increased road noise and shorter tread life. You should drive cautiously after

switching tires and get acclimated to the new handling and braking performance characteristics. If winter tires are not

available in the same speed rating as the original equipment tires, you must be sure not to exceed the speed rating

of the winter tire chosen.
Some Available Choices

The tires listed in the chart below are some of the choices in winter tires currently available in sizes that match the

OE tire. Due to seasonal model changes and constantly changing availability, all of the tires listed below are not

guaranteed to be in stock. We believe these sources and their equipment to be reliable. There may be additional

manufacturers of such products. General Motors does not endorse, indicate any preference for or assume any

responsibility for the products or equipment from these firms or for any such items which may be available from other

sources. A product's inclusion in the chart below does not imply any guaranteed level of performance. Purchase of

any of the tires below is at the customer's cost and any and all warranties expressed are the sole responsibility of the

tire manufacturer.
Parts Information

The following tires are available for order through the GM Tire Program. Some tires may specify revised load ratings

and/or recommended pressures.

Important: Please note that in all cases, winter tires are designed to be used as a set of 4 tires. Do Not install winter

tires only on the driving wheels.

Available Winter Tires

GM does not have an approved winter tire available for the 2015 Chevrolet Corvette Z06/Z07.

Model

Year

Vehicle
20132015
20102015
ATS

Sedan/

Coupe
O.E. Rim
Position

(Fr/Rr)
O.E.

Tire Size
Winter

Tire Size
Speed

Rating
Winter

Rim (If

Required)
Winter Tire

Brand/

Pattern
17 x 8.0
Bridgestone

Blizzak

LM-25 RFT
19250234
Bridgestone

Blizzak

LM-60 RFT
19250224
P/N
17 x 8.0
ALL
P225/

45R17

90H/V
225/

45R17
V
18 x 8.0
ALL
225/

40R18 92V
225/

40R18
H
18 x 8.0
Fr
225/

40RF18

88W
225/

40R18
V
18 x 8.0
Pirelli W240

Sottozero

S2 RunFlat
19295842
18 x 9.0
Rr
255/

35RF18

90W
255/

35RF18
V
18 x 9.0
Pirelli W240

Sottozero

S2 RunFlat
19249704
19 x 9.0
Fr
255/

40ZR19

96Y
255/

40R19 XL
V
19 x 9.0
Pirelli W240

Sottozero
19164570
19 x 9.5
Rr
285/

35ZR19

99Y
285/

35R19 XL
V
19 x 9.5
Pirelli W240

Sottozero
19160922
CTS-V
18 x 8.0
Model

Year

Vehicle
20112015
20102013
O.E. Rim
Position

(Fr/Rr)
O.E.

Tire Size
Winter

Tire Size
Speed

Rating
Winter

Rim (If

Required)
Winter Tire

Brand/

Pattern
18 x 8.5
Fr
P235/

50R18 97V
235/

50R18
V
18 x 8.5
Dunlop SP

Winter Sport

4D 97V
19298018
18 x 9.0
Rr
P265/

45R18

101V
255/

45R18
V
Dunlop SP

Winter

Sport 3D
19254193
19 x 8.5
Fr
P245/

45ZR19

98Y
245/

45R19
V
19 x 8.5
Pirelli W240

Sottozero S2
19249716
19 x 9.5
Rr
P275/

40ZR19

101Y
275/

40R19
V
19 x 9.5
Pirelli W240

Sottozero S2
19253722
19 x 8.5
ALL
245/

45ZR19

98Y
245/

45R19
V
19 x 8.5
Pirelli W240

Sottozero S2
19249716
17 x 8.0
ALL
P235/

55R17 98H
235/

55R17
V
17 x 8.0
Michelin

X-ICE
19295495
P235/

50R18 97V
235/

50R18
V
18 x 8.5
Dunlop SP

Winter Sport

4D 97V
19298018
235/

50ZR18

97Y
235/

50R18
V
18 x 8.5
Dunlop SP

Winter Sport

4D 97V
19298018
CTS Coupe
CTS Sedan

18 x 8.5
20102014
20142015
20112015
CTS Wagon
CTS Sedan

(VIN A)

CTS–V

Sport
ALL
18 x 9.0
P/N
19 x 8.5
ALL
245/

45ZR19

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