The 2009 Cadillac CTS sits in the second-generation CTS lineup, a sedan known for sharp-edged styling and a more serious performance character than earlier Cadillac sport sedans. Tire selection on this car depends heavily on the exact configuration, because the base CTS, Performance Package cars, Summer Tire Package cars, and CTS-V front and rear positions do not all use the same size. Every primary fitment here is radial, with sizes spanning 17-, 18-, and 19-inch rims. Available choices also vary by brand, series, and sidewall treatment, including blackwall, redline, raised white letter, goldline, and wide whitewall options. The right pick starts with confirming the exact sub-model and wheel setup before narrowing the tire's appearance and driving intent.
Which Tire Size Is Right for The 2009 Cadillac CTS
The 2009 Cadillac CTS uses four primary tire sizes, and the correct one depends on the exact sub-model and wheel package. All of them are radial metric sizes, but they are split across 17-inch, 18-inch, and 19-inch rims, so confirming the car's actual wheel diameter is the first step. CTS-V fitment also separates front and rear sizes, making position-specific selection especially important.
A 235/55R17 tire uses a 235-millimeter section width, a 55-series aspect ratio, radial construction, and a 17-inch rim. On the 2009 Cadillac CTS, this size is the standard radial fitment for the Base model and suits buyers who need to stay with the factory wheel diameter used on that configuration. Product choices in this size range from blackwall performance-oriented offerings to restoration-flavored goldline, redline, and wide whitewall radials from American Classic and Coker Classic. It is the size to evaluate when the car retains its 17-inch setup and the goal is balancing correct fitment with the preferred appearance.
A 255/40R19 tire is a metric radial with a 255-millimeter section width, a 40-series profile, and a 19-inch rim requirement. On the 2009 Cadillac CTS, this size serves the front position of the CTS-V, so it should be treated as a specific performance fitment rather than a universal CTS tire. Available choices include blackwall BFGoodrich performance series as well as Pro-Trac Street Pro III options in raised white letter and redline sidewalls. This is the size to focus on when the car is a CTS-V with its 19-inch front wheel arrangement still in place.
A 285/35R19 tire combines a 285-millimeter section width with a 35-series profile in radial construction for a 19-inch wheel. On the 2009 Cadillac CTS, it is the rear fitment for the CTS-V, so it works as part of a staggered setup rather than a same-size arrangement at all four corners. Product selection centers on blackwall BFGoodrich offerings and Pro-Trac Street Pro III tires with raised white letter or redline sidewalls. This size matters most when preserving the CTS-V's front-to-rear sizing strategy and confirming that the rear wheels match the intended 19-inch configuration.
A 235/50R18 tire uses a 235-millimeter section width, a 50-series aspect ratio, radial construction, and an 18-inch rim. On the 2009 Cadillac CTS, this size applies to cars equipped with the Performance Package or Summer Tire Package, so it sits between the base 17-inch fitment and the CTS-V's 19-inch setup. Choices include blackwall tires from BFGoodrich and Nitto, along with Pro-Trac Street Pro III versions in redline and raised white letter form. It is the right size to evaluate when the sedan carries its package-specific 18-inch wheels and the buyer wants to compare both performance-focused and appearance-oriented options.
Sub-model fitment on the 2009 Cadillac CTS is not uniform, so the right tire starts with identifying the exact version of the car. Wheel diameter and, on the CTS-V, front-versus-rear position both affect which size belongs on the vehicle.
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2009 Cadillac CTS Base
The 2009 Cadillac CTS Base uses the 235/55R17 radial size on a 17-inch wheel. Tire selection here is mostly about choosing among available brands, series, and sidewall styles while keeping the original wheel diameter and overall fitment strategy intact.
The 2009 Cadillac CTS V Front uses a 255/40R19 radial tire. That makes front-position confirmation important, especially on a staggered setup, and it shifts the buying decision toward matching the correct 19-inch front fitment and the preferred performance or sidewall style.
The 2009 Cadillac CTS V Rear uses a 285/35R19 radial tire. Rear fitment should be chosen with the staggered CTS-V layout in mind so the wheel, width range, and overall setup remain consistent with the car's rear 19-inch application.
The 2009 Cadillac CTS with Performance Package uses the 235/50R18 radial size. Buyers should confirm that the car still carries its 18-inch package wheels, then compare available blackwall, redline, or raised white letter choices in that size.
The 2009 Cadillac CTS with Summer Tire Package also uses 235/50R18 radial tires. Selection comes down to keeping the proper 18-inch fitment while deciding whether a straightforward blackwall tire or a more distinctive sidewall treatment better suits the car.
The tire sizes listed on this page assume factory-standard vehicle configuration. The following modifications may affect tire fitment and are not reflected in this guide:
Suspension changes (lowering, lift kits, spring replacements)
Body alterations (fender modifications, custom bodywork)
If your vehicle has been modified from factory specifications, verify tire clearance before purchase.
Best 2009 Cadillac CTS Tires for Sale
Available 2009 Cadillac CTS tires span 17-, 18-, and 19-inch radial sizes from BFGoodrich, American Classic, Coker Classic, Pro-Trac, and Nitto. Depending on the fitment, buyers can compare blackwall, redline, raised white letter, goldline, and wide whitewall styles across several tire series.
These FAQs focus on the exact tire sizes used on the 2009 Cadillac CTS, how they change by sub-model, and what to compare in radial fitment, wheel size, sidewall style, and road-use preparation.
Tire Size & Fitment
What tire size fits a 2009 Cadillac CTS?
The 2009 Cadillac CTS does not use one universal tire size across every configuration. Base models use 235/55R17, Performance Package and Summer Tire Package cars use 235/50R18, and the CTS-V uses a staggered 19-inch setup with 255/40R19 in front and 285/35R19 in the rear.
The practical next step is confirming the exact sub-model and the wheel diameter currently on the car. A CTS that has had wheels swapped over the years may no longer match its original package, and the CTS-V requires separate front and rear size verification before choosing replacement tires.
What size rim does a 2009 Cadillac CTS use?
A 2009 Cadillac CTS can use 17-inch, 18-inch, or 19-inch rims depending on the version of the car. The Base model uses a 17-inch rim with 235/55R17 tires, Performance Package and Summer Tire Package cars use 18-inch rims with 235/50R18 tires, and the CTS-V uses 19-inch rims with different front and rear sizes.
Checking the wheel itself matters more than assuming all CTS sedans were equipped the same way. Wheel changes, trim-package differences, and staggered front-to-rear layouts can all affect selection, so matching the tire to the actual rim diameter on the car is the safest place to begin.
Why does the 2009 Cadillac CTS have more than one tire size?
The 2009 Cadillac CTS has more than one tire size because different sub-models and wheel packages use different fitment strategies. A Base CTS runs a 17-inch size, package-equipped cars move to an 18-inch size, and the CTS-V uses two separate 19-inch sizes to support its front and rear staggered layout.
That means tire shopping starts with the car's exact configuration rather than the badge on the trunk alone. Confirm the sub-model, check whether the car still has its original wheel package, and on a CTS-V verify front and rear positions separately before comparing brands or sidewall styles.
Choosing the Right Tire
What should I consider when choosing a 2009 Cadillac CTS tire?
Start with the correct tire size for the car's exact configuration, since a 2009 Cadillac CTS may use 235/55R17, 235/50R18, 255/40R19, or 285/35R19. After size is confirmed, compare construction details within the radial options, including rim-width suitability, load figures where stated, tire series, and the kind of appearance or road use the car is meant for.
A Base CTS, a package-equipped CTS, and a CTS-V do not present the same buying decision. Some buyers will want a straightforward blackwall performance tire, while others may prefer redline, goldline, raised white letter, or wide whitewall styling that better matches the vehicle's visual theme.
What sidewall styles are available for 2009 Cadillac CTS tires?
Sidewall choices for the 2009 Cadillac CTS vary by tire size. Blackwall options appear across all four fitments, while redline and raised white letter choices are available in several 18-inch and 19-inch sizes, and the 235/55R17 size also offers goldline and wide whitewall treatments.
That makes sidewall style an appearance decision after the correct size is established. A Base CTS on 17-inch wheels has the broadest traditional styling range, while 18-inch and 19-inch applications lean more toward blackwall, redline, and raised white letter choices tied to a sportier presentation.
What brands offer tires for the 2009 Cadillac CTS?
Tires for the 2009 Cadillac CTS are available from BFGoodrich, American Classic, Coker Classic, Pro-Trac, and Nitto, depending on size. BFGoodrich appears across the range, American Classic and Coker Classic show up in 235/55R17, Pro-Trac covers several 18-inch and 19-inch fitments, and Nitto appears in 235/50R18.
Brand choice should be weighed alongside size, sidewall style, tire series, and wheel compatibility rather than treated as the first decision. Once the correct CTS fitment is confirmed, comparing available series within that size gives a clearer picture of whether the tire matches the car's intended look and use.
Restoration & Appearance
Which tire should I choose for a period-style 2009 Cadillac CTS?
A period-style 2009 Cadillac CTS tire starts with the correct size for the exact sub-model, then moves into sidewall and series selection. The 235/55R17 Base fitment offers the widest appearance range, including goldline, redline, and wide whitewall radials, while 18-inch and 19-inch sizes are available in more performance-oriented blackwall, redline, and raised white letter forms.
The best visual match depends on how the car is being presented. A cleaner contemporary look may favor blackwall, while a more customized or nostalgic presentation may lean toward redline, goldline, or whitewall treatments. Exact originality questions are best settled with model-specific reference material and marque-focused restoration sources.
How does tire construction affect the appearance of a restored 2009 Cadillac CTS?
On the 2009 Cadillac CTS, primary fitment stays within radial construction, so the visual difference comes less from bias-ply versus radial and more from sidewall treatment and tread presentation. Blackwall tires give the most modern, understated look, while redline, raised white letter, goldline, and wide whitewall options can shift the car's personality significantly.
That matters most on cars being restored, preserved, or personalized around a specific visual theme. Matching the proper size and rim diameter keeps the stance appropriate, while the sidewall choice helps determine whether the car reads as stock-leaning, sport-oriented, or more custom in its overall presentation.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2009 Cadillac CTS?
Yes, modifications can affect tire fitment on a 2009 Cadillac CTS even when the tire size looks close on paper. Aftermarket wheels, changes in wheel width, suspension lowering, alignment changes, or body modifications can all alter how a 17-, 18-, or 19-inch tire sits within the fender and steering envelope.
That is especially important on the CTS-V, where front and rear tires are already different sizes. Before replacing tires on a modified car, verify actual wheel diameter and width, then check clearance at full steering lock and through suspension travel so the chosen tire matches the car's current setup.
What should I inspect before driving a 2009 Cadillac CTS on new tires?
Before driving a 2009 Cadillac CTS on new tires, inspect the wheels for damage, confirm that the tire size matches the correct sub-model, and make sure front and rear positions are correct on a CTS-V. It is also smart to check valve stems, alignment condition, and basic suspension wear points that can affect how the new tires contact the road.
A fresh set of tires cannot compensate for bent wheels, worn components, or improper inflation. After installation, recheck air pressure, look for any rubbing or uneven clearance, and pay attention to vibration or pull during the first miles so small fitment issues are caught early.
How often should tires on a 2009 Cadillac CTS be inspected?
Tires on a 2009 Cadillac CTS should be inspected regularly, especially if the car is driven infrequently or stored for long periods. Look over tread wear, sidewall condition, cuts, bulges, and air pressure at routine intervals, and give extra attention to staggered CTS-V fitments so front and rear tires are assessed as separate applications.
Collector-minded or low-mileage cars can age their tires without showing much tread wear, so visual condition matters as much as mileage. An inspection before longer drives is worthwhile, and any signs of cracking, persistent air loss, or unusual wear should be addressed before the car returns to regular road use.
